136-605: Lake Geneva is a deep lake on the north side of the Alps , shared between Switzerland and France . It is one of the largest lakes in Western Europe and the largest on the course of the Rhône . Sixty percent (345.31 km or 133.32 sq mi) of the lake belongs to Switzerland (the cantons of Vaud , Geneva and Valais ) and forty percent (234.71 km or 90.62 sq mi) to France (the department of Haute-Savoie ). While
272-474: A tripoint between France, Italy and Switzerland; it also marks the border between two climate regions by separating the northern and western Alps from the southern Alps. The mountains of the massif consist mostly of granite and gneiss rocks and at high altitudes the vegetation is an arctic-alpine flora. The valleys that delimit the massif were used as communication routes by the Romans until they left around
408-409: A body of water from 2 hectares (5 acres) to 8 hectares (20 acres). Pioneering animal ecologist Charles Elton regarded lakes as waterbodies of 40 hectares (99 acres) or more. The term lake is also used to describe a feature such as Lake Eyre , which is a dry basin most of the time but may become filled under seasonal conditions of heavy rainfall. In common usage, many lakes bear names ending with
544-717: A body on the Glacier du Talèfre, close to the Couvercle Hut. It was identified as that of a young Chamonix guide who had been caught in a winter storm during a solo ascent of the Nant Blanc face of the Aiguille Verte in 1982 and was assumed to have fallen into a crevasse. In 2013, a box of valuable gemstones was found by a climber on the Bossons Glacier. It had re-emerged, having been carried 3,048 metres (10,000 ft) downhill from
680-624: A chalet to the north of Lake Geneva in 1976, which inspired him to take up painting and informed the first stages of the " Berlin Trilogy ". Pop singer Phil Collins lives in a home overlooking the lake. Rock band Queen owned and operated Mountain Recording Studios (which is still in use today) in Montreux , and a statue of lead singer Freddie Mercury , who also owned a second home in Montreux, stands on
816-478: A code of practice put in place which requires an annual declaration of all finds to be made. It also gives a right for the Chamonix crystal museum (Musée des Cristaux) to have first option to acquire specimens of significance for its collections. To further protect the scientific value of material collected, all specimens offered for sale must be labelled with details of where they were found. The crystal museum opened to
952-496: A comprehensive analysis of the origin of lakes and proposed what is a widely accepted classification of lakes according to their origin. This classification recognizes 11 major lake types that are divided into 76 subtypes. The 11 major lake types are: Tectonic lakes are lakes formed by the deformation and resulting lateral and vertical movements of the Earth's crust. These movements include faulting, tilting, folding, and warping. Some of
1088-564: A distance of just 8 kilometres (5.0 mi). Because of its great elevation, much of the massif is snow- and ice-covered, and has been deeply dissected by glaciers. The Mer de Glace is the longest glacier in the range as well as the longest in France and the second longest in the Alps. The debris-covered Miage Glacier on the southern side of the massif is the longest in Italy. The summit of Mont Blanc
1224-402: A form of organic lake. They form where a buildup of partly decomposed plant material in a wet environment leaves the vegetated surface below the water table for a sustained period of time. They are often low in nutrients and mildly acidic, with bottom waters low in dissolved oxygen. Artificial lakes or anthropogenic lakes are large waterbodies created by human activity . They can be formed by
1360-538: A higher perimeter to area ratio than other lake types. These form where sediment from a tributary blocks the main river. These form where sediment from the main river blocks a tributary, usually in the form of a levee . Lakes formed by other processes responsible for floodplain basin creation. During high floods they are flushed with river water. There are four types: 1. Confluent floodplain lake, 2. Contrafluent-confluent floodplain lake, 3. Contrafluent floodplain lake, 4. Profundal floodplain lake. A solution lake
1496-510: A hypolimnion; accordingly, very shallow lakes are excluded from this classification system. Based upon their thermal stratification, lakes are classified as either holomictic , with a uniform temperature and density from top to bottom at a given time of year, or meromictic , with layers of water of different temperature and density that do not intermix. The deepest layer of water in a meromictic lake does not contain any dissolved oxygen so there are no living aerobic organisms . Consequently,
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#17330863445601632-428: A lake consists of a large area of standing water that occupies an extensive closed depression in limestone, it is also called a karst lake . Smaller solution lakes that consist of a body of standing water in a closed depression within a karst region are known as karst ponds. Limestone caves often contain pools of standing water, which are known as underground lakes . Classic examples of solution lakes are abundant in
1768-470: A large number of studies agree that small ponds are much more abundant than large lakes. For example, one widely cited study estimated that Earth has 304 million lakes and ponds, and that 91% of these are 1 hectare (2.5 acres) or less in area. Despite the overwhelming abundance of ponds, almost all of Earth's lake water is found in fewer than 100 large lakes; this is because lake volume scales superlinearly with lake area. Extraterrestrial lakes exist on
1904-522: A little "chalet" at the French bank, near Geneva. Actor Charlie Chaplin spent his final years and died in Vevey (there is a memorial statue of him along the promenade; his home at Corsier-sur-Vevey is now a museum of his life and career). Actors Noël Coward , James Mason , Sir Peter Ustinov , Richard Burton , and Audrey Hepburn all lived in villages on the shores of or in view of the lake. David Bowie moved to
2040-465: A loud underwater sound that could be measured at a distance. The flash of the exploding gunpowder provided the visual starting cue for the timepiece, and the underwater explosion sound striking a bell provided the finish cue. The lake is rich in wildlife, especially birds: both the common buzzard and the red kite breed here in considerable numbers. Yacht racing is a popular sport, and high-performance catamarans have been developed specifically for
2176-653: A meagre harvest of rye and oats . Some farmers in the valley of Chamonix joined their counterparts from the neighbouring valleys of Maurienne , Beaufortain and Tarentaise and crossed the Alps into southern Germany, Austria and northern Italy to sell their products and bring back goods for sale in local markets. In 1741, the Chamouny valley and its glaciers on the north side of the massif were discovered and written about by two aristocratic travelling Englishmen, named William Windham and Richard Pococke . The descriptions of their exploits were published across Europe, bringing
2312-489: A natural outflow and lose water solely by evaporation or underground seepage, or both. These are termed endorheic lakes. Many lakes are artificial and are constructed for hydroelectric power generation, aesthetic purposes, recreational purposes, industrial use, agricultural use, or domestic water supply . The number of lakes on Earth is undetermined because most lakes and ponds are very small and do not appear on maps or satellite imagery . Despite this uncertainty,
2448-567: A number of articles on the flora around the Mont Blanc area, including a list of the flowering plants, ferns mosses and lichens found at les Grands Mulets and elsewhere in the massif around Chamonix and the Aosta Valley. High up in the middle of the Glacier de Talèfre, completely surrounded by ice, and due south of Les Droites, lies a large triangular region of steep mountainside containing an unusual mixture of high-alpine vegetation. Known as
2584-403: A result of meandering. The slow-moving river forms a sinuous shape as the outer side of bends are eroded away more rapidly than the inner side. Eventually a horseshoe bend is formed and the river cuts through the narrow neck. This new passage then forms the main passage for the river and the ends of the bend become silted up, thus forming a bow-shaped lake. Their crescent shape gives oxbow lakes
2720-522: A result of the 1959 Hebgen Lake earthquake . Most landslide lakes disappear in the first few months after formation, but a landslide dam can burst suddenly at a later stage and threaten the population downstream when the lake water drains out. In 1911, an earthquake triggered a landslide that blocked a deep valley in the Pamir Mountains region of Tajikistan , forming the Sarez Lake . The Usoi Dam at
2856-410: A scientific footnote, in 1827, Lake Geneva was the site for the first measurement of the speed of sound in (fresh) water. French mathematician Jacques Charles François Sturm and Swiss physicist Daniel Collodon used two moored boats, separated by a measured distance, as the transmitting and receiving platforms for the sounds of exploding gunpowder. The loud airborne sound coupled into the lake, establishing
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#17330863445602992-537: A significant impact on the environment and on human activity. In 1892, a large body of water which had accumulated under the surface of the Tête Rousse Glacier , burst suddenly on the night of 11 July. It released 200,000 cubic metres (7,100,000 cu ft) of water and ice which flowed down the mountainside, killing 175 people in Saint-Gervais. The recent rediscovery of a further build-up of water deep within
3128-677: A small population of albino marmots within Val Ferret). Eurasian lynx have been reintroduced into the French Alps and, although present around the Mont Blanc massif, are extremely unlikely to be encountered. Over 80 different bird species have been recorded on the Italian side of the massif from within Val Ferret, including 63 nesting species and nine regional or national rarities. The following birds have been recorded in different habitats right across
3264-422: A variation in density because of thermal gradients. Stratification can also result from a density variation caused by gradients in salinity. In this case, the hypolimnion and epilimnion are separated not by a thermocline but by a halocline , which is sometimes referred to as a chemocline . Lakes are informally classified and named according to the seasonal variation in their lake level and volume. Some of
3400-443: Is sag ponds . Volcanic lakes are lakes that occupy either local depressions, e.g. craters and maars , or larger basins, e.g. calderas , created by volcanism . Crater lakes are formed in volcanic craters and calderas, which fill up with precipitation more rapidly than they empty via either evaporation, groundwater discharge, or a combination of both. Sometimes the latter are called caldera lakes, although often no distinction
3536-495: Is 46 kilometres (29 mi) long and lies in a southwest to northeasterly direction across the borders of France ( Haute-Savoie and Savoie ), Italy ( Aosta Valley ) and Switzerland (western Valais ). At its widest point the massif is 20 km (12 mi) across. The northwestern side of the massif lies mostly within France, and is bounded by the valley of the Arve , containing the towns of Argentière , Chamonix and Les Houches . To
3672-403: Is a lake occupying a basin formed by surface dissolution of bedrock. In areas underlain by soluble bedrock, its solution by precipitation and percolating water commonly produce cavities. These cavities frequently collapse to form sinkholes that form part of the local karst topography . Where groundwater lies near the grounds surface, a sinkhole will be filled water as a solution lake. If such
3808-564: Is again considered safe to swim in the lake. Major leisure activities practiced include sailing, wind surfing, boating (including water skiing and wake-boarding), rowing, scuba diving, and bathing. A total of four submarines have plied the depths of Lake Geneva. In 1964, Jacques Piccard launched a tourist-oriented submarine, the Auguste Piccard (named for his explorer father ), for the Swiss National Exhibition, meant to honor
3944-512: Is an ice cap whose thickness varies from year to year. The entire massif can be circumnavigated by the Tour du Mont Blanc , a walking route of approximately 170 kilometres (110 mi). It usually takes around 11 days to complete, but is also used for an annual mountain ultramarathon , with top competitors expected to complete the whole route in less than 21 hours. The main mountain passes, or cols , that connect different valleys and towns around
4080-555: Is bounded to the east by a separate valley, confusingly also called Val Ferret , and which separates it from the Pennine Alps . Its watercourse, la Dranse de Ferret , flows northwards to join the Rhône at Martigny . The west side of the northern end of the massif is drained by the Trient , also joining the Rhône near Martigny. The borders of all three countries converge at a tripoint near
4216-561: Is called Lavaux and is famous for its hilly vineyards. The average surface elevation of 372 m (1,220 ft) above sea level is controlled by the Seujet Dam [ fr ] in Geneva. Due to climate change , the average temperature of deep water (more than 300 metres or 980 feet deep) increased from 4.4 °C (39.9 °F) in 1963 to 5.5 °C (41.9 °F) in 2016 (an increase of 1.1 °C or 2.0 °F in 53 years), while
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4352-462: Is dammed behind an ice shelf that is attached to the coastline. They are mostly found in Antarctica. Fluvial (or riverine) lakes are lakes produced by running water. These lakes include plunge pool lakes , fluviatile dams and meander lakes. The most common type of fluvial lake is a crescent-shaped lake called an oxbow lake due to the distinctive curved shape. They can form in river valleys as
4488-578: Is distributed fairly evenly over all months of the year, and mostly originates from a westerly airflow. There is, however, significant variation in precipitation with altitude. For example, Chamonix has an elevation of approximately 1,030 metres (3,380 ft) and receives around 1,020 mm (40 in) of annual precipitation, whilst the Col du Midi, which is at 3,500 metres (11,500 ft) above sea level, receives significantly more, totalling 3,100 mm (122 in). However, at an even higher altitude (near to
4624-404: Is further influenced by the different aspects of the faces, by the geology, and by the influence of man on the lower and middle slopes where forest clearance has created open grassland . The native forest habitats are essential for the survival of many species, with the key conifer species including larch, pine, stone pine and red pine. Over a thousand plant species have been recorded across
4760-439: Is known today that at least 68 separate mineral species occur across the whole range of the Mont Blanc massif. In order to preserve the mineralogical heritage of Mont Blanc, in 2008 the commune of Chamonix banned all mineral-hunting activities and collection of specimens without a prior permit being issued by the mayor 's office. Use of explosives , heavy machinery or helicopters for removing material were also banned, and
4896-501: Is located at 2,173 m (7,129 ft) above sea level, and is the highest botanical garden in Europe. It contains around 800 plant species and covers an area of 7,000 square metres (75,000 sq ft). It was originally created in 1987 just as a tourist attraction but, with the subsequent designation of the adjacent Pavillon du Mont Frety as a protected area, it has since increased in scientific importance. It can be reached either from
5032-401: Is located has been occupied by humans for at least 70,000 years, although, as now—and because of the great height and glaciated nature of the mountains—only the lower parts of the valleys around its perimeter would have been inhabited or used as routes of communication. The Romans, who occupied the region 2,000 years ago, used the main valleys around the massif for military purposes. They gave
5168-448: Is made. An example is Crater Lake in Oregon , in the caldera of Mount Mazama . The caldera was created in a massive volcanic eruption that led to the subsidence of Mount Mazama around 4860 BCE. Other volcanic lakes are created when either rivers or streams are dammed by lava flows or volcanic lahars . The basin which is now Malheur Lake , Oregon was created when a lava flow dammed
5304-404: Is now a major tourist destination, drawing in over six million visitors per year. It provides a wide range of opportunities for outdoor recreation and activities such as sight-seeing, hiking , rock climbing , mountaineering and skiing . Around one hundred people a year die across its mountains and, occasionally, bodies have been lost and entombed in its glaciers for decades. Access into
5440-401: Is significantly less than that in either Courmayeur or Chamonix. The massif contains a very rich variety of biodiversity as a result of the huge height range and different habitats found between the valleys and the highest summits. Mild temperatures occur at altitudes between 600 and 1,000 metres (2,000 and 3,300 ft), whereas arctic conditions occur from 2,500 metres (8,200 ft) up to
5576-410: Is the lowest point of the cantons of Valais and Vaud. The culminating point of the lake's drainage basin is Monte Rosa at 4,634 metres above sea level. The beauty of the shores of the lake and of the sites of many of the places near its banks has long been celebrated. However, it is only from the eastern end of the lake, between Vevey and Villeneuve, that the scenery assumes an Alpine character. On
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5712-429: Is unknown but is estimated to be at least 2 million. Finland has 168,000 lakes of 500 square metres (5,400 sq ft) in area, or larger, of which 57,000 are large (10,000 square metres (110,000 sq ft) or larger). Most lakes have at least one natural outflow in the form of a river or stream , which maintain a lake's average level by allowing the drainage of excess water. Some lakes do not have
5848-718: The Dora Baltea towards Aosta , eventually joining the Po. However, the extreme western end of the southern side of the massif does lie within France and is bounded by the Vallée des Glaciers (which connects to the Val Veny over the watershed of the col de la Seigne), and its waters flow southwards towards the Isère and onwards to the Rhône. The northernmost section of the massif falls within Switzerland, and
5984-648: The Expo 64 theme of accomplishments by Swiss engineers and industry. After operating through to 1965 in Lake Geneva, Piccard used the vessel for scientific exploration in other parts of the world. Piccard later built the F.-A. Forel , launched in Lake Geneva in 1978 and used primarily for scientific research until it was retired in 2005. In 2011, in a collaborative operation led by École Polytechnique Fédérale de Lausanne , two Mir submersibles were used for ten weeks to conduct extensive scientific research in Lake Geneva. On
6120-504: The Jardin de Talèfre , its name derives from the rich assemblage of plants which occur at great altitude there (between 2,650 and 3,000 m (8,690 and 9,840 ft)). Described as "one of the loftiest patches of vegetation in Europe upon an islet of rock in the midst of a wilderness of snow and ice", it is higher than the adjacent ground by tens of metres and, as a result, was spared glacial scouring and subsequent loss of its vegetation during
6256-1023: The Little Ice Age (between 1300 and 1850). Nevertheless, it would at that time still have been surrounded by ice on all three sides, as evidenced by the three glacial moraines found there today. Species recorded there include: Achillea nana ; Alchemilla pentaphylla ; Arenaria biflora [ de ] ; Arenaria serpyllifolia ; Cardamine alpina ; Draba frigida ; Empetrum nigrum ; Epilobium alpinum ; Helictotrichon versicolor [ pl ] ; Homogyne alpina ; Jacobaea incana ; Juncus trifidus ; Kalmia procumbens ; Poa laxa [ pl ] ; Potentilla frigida [ de ] ; Ranunculus glacialis ; Ranunculus pyrenaeus [ de ] ; Saxifraga aspera ; Saxifraga bryoides ; Saxifraga oppositifolia ; Sedum alpestre [ es ] ; Sibbaldia procumbens and Trifolium alpinum . The Saussurea Alpine Botanical Garden above Courmayeur
6392-752: The Malheur River . Among all lake types, volcanic crater lakes most closely approximate a circular shape. Glacial lakes are lakes created by the direct action of glaciers and continental ice sheets. A wide variety of glacial processes create enclosed basins. As a result, there are a wide variety of different types of glacial lakes and it is often difficult to define clear-cut distinctions between different types of glacial lakes and lakes influenced by other activities. The general types of glacial lakes that have been recognized are lakes in direct contact with ice, glacially carved rock basins and depressions, morainic and outwash lakes, and glacial drift basins. Glacial lakes are
6528-539: The Pennine Alps and the Bernese Alps . The first ascent of Mont Blanc in 1786 by Jacques Balmat and Michel Paccard initiated the sport of alpine mountaineering, and it was during the golden age of alpinism (1854–65) and the silver age of alpinism (1865–82) that the majority of the main summits of the massif were first attained. Members of the England-based Alpine Club were instrumental in many of
6664-540: The Proto-Indo-European root * leǵ- ('to leak, drain'). Cognates include Dutch laak ('lake, pond, ditch'), Middle Low German lāke ('water pooled in a riverbed, puddle') as in: de:Wolfslake , de:Butterlake , German Lache ('pool, puddle'), and Icelandic lækur ('slow flowing stream'). Also related are the English words leak and leach . There is considerable uncertainty about defining
6800-399: The density of water varies with temperature, with a maximum at +4 degrees Celsius, thermal stratification is an important physical characteristic of a lake that controls the fauna and flora , sedimentation, chemistry, and other aspects of individual lakes. First, the colder, denser water typically forms a layer near the bottom, which is called the hypolimnion . Second, normally overlying
6936-605: The ocean , although they may be connected with the ocean by rivers . Lakes, as with other bodies of water , are part of the water cycle , the processes by which water moves around the Earth. Most lakes are freshwater and account for almost all the world's surface freshwater, but some are salt lakes with salinities even higher than that of seawater . Lakes vary significantly in surface area and volume of water. Lakes are typically larger and deeper than ponds , which are also water-filled basins on land, although there are no official definitions or scientific criteria distinguishing
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#17330863445607072-413: The 1980s, intense environmental pollution ( eutrophication ) had almost wiped out all the fish. Endemic whitefish species Coregonus fera was last recorded in the lake in 1920 and is now extinct. Although the name fera is still used for the only coregonid present in the lake, this is not the original species but the introduced C. palaea . Today, pollution levels have been dramatically cut back, and it
7208-582: The 5th century AD, they had left completely. The areas left behind were occupied in the western part by the Burgundian tribes from what is today France, whilst the Alemanni tribes from Germany moved into eastern parts, resulting in the linguistic divide found today across the Alps. For many centuries thereafter, the settlements around the Mont Blanc massif comprised a rural population of peasant mountain farmers, living off animal husbandry , supplemented with
7344-435: The 5th century AD. The region remained of some military importance through to the mid-20th century. A peasant farming economy operated within these valleys for many centuries until the glaciers and mountains were "discovered" by the outside world in the 18th century. Word of these impressive sights began to spread, and Mont Blanc was first climbed in 1786, marking the start of the sport of mountaineering. The region
7480-433: The Chamonix valley by Charles Albert of Sardinia for reconstructing the towns of Sallanches and Cluses , both of which had at that time just been destroyed by fires. The massif has been an important source of mineral specimens for crystal -hunters for over 250 years. The mountaineer and explorer, Edward Whymper , noted that the basin of the Glacier de Talèfre was "considered good hunting-ground for crystals", and that
7616-583: The Earth by extraterrestrial objects (either meteorites or asteroids ). Examples of meteorite lakes are Lonar Lake in India, Lake El'gygytgyn in northeast Siberia, and the Pingualuit crater lake in Quebec, Canada. As in the cases of El'gygytgyn and Pingualuit, meteorite lakes can contain unique and scientifically valuable sedimentary deposits associated with long records of paleoclimatic changes. In addition to
7752-551: The Lusatian Lake District, Germany. In India, Sudarshana Lake is a historical artificial lake located in the semi-arid region of Girnar, Gujarat, originally constructed during the reign of Chandragupta Maurya. See: List of notable artificial lakes in the United States Meteorite lakes, also known as crater lakes (not to be confused with volcanic crater lakes ), are created by catastrophic impacts with
7888-535: The Miage Glacier and the Brenva Glacier, are very heavily covered in rock debris. The massif is itself defined by broad valleys which formed along fault lines and which have subsequently been shaped by ice during the last glacial period of the ice age. During the mid-19th century the granite of the Mont Blanc massif was an important source of stone for buildings; one hundred Italian stonemasons were brought to
8024-635: The Miage Glacier is Italy's longest glacier and also the largest debris-covered glacier in Europe. Other large glaciers include the Argentière Glacier (9 km (5.6 mi)), the Saleina Glacier (6 km (3.7 mi)), Trient Glacier (4 km (2.5 mi)), the Bossons Glacier ( c. 4 km (2.5 mi)) and the Brenva Glacier. Whilst these glaciers appear to show similar fluctuations in length, research shows that each glacier of
8160-464: The Mont Blanc massif are: The Mont Blanc massif includes eleven independent and six subsidiary summits over 4,000 metres (13,123 ft) in height. These (including Mont Blanc) are shared between Italy and France only, the highest in Switzerland being the Aiguille d'Argentière. The massif is amongst the three major subranges of the Alps having the highest concentration of four-thousanders, together with
8296-583: The Mont Blanc massif has its own individual and distinctive response time to changes in snowfall and climate. The Bossons Glacier is known to respond first, then the Argentière and the Trient Glaciers respond four to seven years later, with the Mer de Glace reacting last —between eleven and fifteen years after changes are first observed in the movement of ice in the Bossons Glacier. Even the smallest glaciers can have
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#17330863445608432-496: The Mont Blanc massif, all of which can be easily reached or viewed. Glaciers cover 170 square kilometres (66 sq mi) of the massif, of which 110 km (42 sq mi) fall within France. The Mer de Glace is the largest glacier in the western Alps , and the second largest in Europe. It has a total length of 12 km (7.5 mi) from highest snowfield to terminus and an area of 35–40 km (14–15 sq mi). At around 10 km (6 mi) in length,
8568-463: The Mont Blanc massif: Seven of the massif's largest indigenous mammal species are housed in the Merlet Animal Park near Les Houches, including ibex, chamois, marmot, fallow and roe deer . Located 600 metres (2,000 ft) above the village, the park was founded in 1968 and contains eighty animal species from mountain habitats around the world. The region in which the Mont Blanc massif
8704-521: The Rocher Rouges, high up on Mont Blanc, during an expedition organised by Joseph Hamel [ de ] . Forty years later the remains of two of them were discovered, re-exposed within fissures in the Bossons glacier. They were 3,000 metres (9,800 ft) lower down from the point where they were lost; the corpse of the third guide was discovered the following year. In 2014, a group of climbers found
8840-597: The Swiss Federal Office of Topography, Swisstopo , Lac de Genève designates that part of the Petit Lac which lies within the cantonal borders of Geneva (excluding the cantonal exclave Céligny ), so about from Versoix – Hermance to the Rhône outflow in Geneva. The Chablais Alps border is its southern shore, and the western Bernese Alps lie over its eastern side. The high summits of Grand Combin and Mont Blanc are visible from some places. The lake lies on
8976-634: The Tour of Mont Blanc. When Savoy was eventually annexed to France in 1860, Napoleon III and Empress Eugénie visited the region to mark the event and undertook to enhance road access leading to the end of the Arve valley. The 19th century saw considerable economic development which turned the small agricultural town of Chamonix into a base for tourists, with luxurious hotels and mountain lodges being built to accommodate them. A trade in selling local items to visiting foreigners soon developed. Crystals collected from across
9112-436: The accumulated steeps; Amongst many other notable visitors were: Goethe (1779); Chateaubriand (1805); Madame de Staël ; Victor Hugo ; Louis Pasteur and Franz Liszt (1836), plus two successive wives of Napoleon Bonaparte : Joséphine de Beauharnais (1810) and Marie Louise of Austria (1814). In 1849, John Ruskin spent a month in Chamonix, from where he painted some of the massif's mountains before undertaking
9248-474: The average temperature of surface water (five metres or 16 feet deep) increased from 10.9 °C (51.6 °F) in 1970 to 12.9 °C (55.2 °F) in 2016 (up 2 °C or 3.6 °F in 46 years). Lake Geneva (and particularly the lakeside parts of the city of Geneva) can be affected by the cold Bise , a northeasterly wind. This can lead to severe icing in winter. The strength of the Bise wind can be determined by
9384-856: The base of the valley has remained in place for more than 100 years but the terrain below the lake is in danger of a catastrophic flood if the dam were to fail during a future earthquake. Tal-y-llyn Lake in north Wales is a landslide lake dating back to the last glaciation in Wales some 20000 years ago. Aeolian lakes are produced by wind action . These lakes are found mainly in arid environments, although some aeolian lakes are relict landforms indicative of arid paleoclimates . Aeolian lakes consist of lake basins dammed by wind-blown sand; interdunal lakes that lie between well-oriented sand dunes ; and deflation basins formed by wind action under previously arid paleoenvironments. Moses Lake in Washington , United States,
9520-459: The bed of the lake, and it appears that within the historical period, the waters extended about 2 km (1.2 mi) beyond the present eastern margin of the lake. The greatest depth of the lake, in the broad portion between Évian-les-Bains and Lausanne , where it is just 13 km (8.1 mi) in width, has been measured as 310 m (1,020 ft), putting the bottom of the lake at 62 m (203 ft) above sea level . The lake's surface
9656-580: The border turns southwards over the Dômes de Miage and Aiguille de Tré la Tête before dropping down to the Col de la Seigne. North of Mont Dolent the border between France and Switzerland meanders roughly north-northwestwards along a ridge-line of slightly lower peaks, including the Aiguille d'Argentière , the Aiguille du Chardonnet and the Aiguille du Tour , before dropping down to the Col de Balme. The Swiss – Italian border runs southwest from Mont Dolent, down to
9792-609: The course of the Rhône . The river has its source at the Rhône Glacier near the Grimsel Pass to the east of the lake and flows down through the canton of Valais , entering the lake between Villeneuve and Le Bouveret , before flowing slowly towards its egress at Geneva . Other tributaries are La Dranse, L'Aubonne, La Morges, La Venoge , La Vuachère, and La Veveyse. Lake Geneva is the largest body of water in Switzerland, and greatly exceeds in size all others that are connected with
9928-915: The courses of mature rivers, where a river channel has widened over a basin formed by eroded floodplains and wetlands . Some lakes are found in caverns underground . Some parts of the world have many lakes formed by the chaotic drainage patterns left over from the last ice age . All lakes are temporary over long periods of time , as they will slowly fill in with sediments or spill out of the basin containing them. Artificially controlled lakes are known as reservoirs , and are usually constructed for industrial or agricultural use, for hydroelectric power generation, for supplying domestic drinking water , for ecological or recreational purposes, or for other human activities. The word lake comes from Middle English lake ('lake, pond, waterway'), from Old English lacu ('pond, pool, stream'), from Proto-Germanic * lakō ('pond, ditch, slow moving stream'), from
10064-513: The creation of lakes by the disruption of preexisting drainage networks, it also creates within arid regions endorheic basins that contain salt lakes (also called saline lakes). They form where there is no natural outlet, a high evaporation rate and the drainage surface of the water table has a higher-than-normal salt content. Examples of these salt lakes include Great Salt Lake and the Dead Sea . Another type of tectonic lake caused by faulting
10200-484: The death warrant of English King Charles I , was granted on 16 April 1662 protection in and continued to live at Vevey until his death in 1692. Mary and Percy Shelley and Lord Byron holidayed by the lake and wrote ghost stories, one of which became the basis for the novel Frankenstein . The Empress Elisabeth of Austria (Sisi) was stabbed to death on the quayside in Geneva in September 1898. Vladimir Lenin rented
10336-622: The difference between lakes and ponds , and neither term has an internationally accepted definition across scientific disciplines or political boundaries. For example, limnologists have defined lakes as water bodies that are simply a larger version of a pond, which can have wave action on the shoreline or where wind-induced turbulence plays a major role in mixing the water column. None of these definitions completely excludes ponds and all are difficult to measure. For this reason, simple size-based definitions are increasingly used to separate ponds and lakes. Definitions for lake range in minimum sizes for
10472-483: The difference in air pressure between Geneva and Güttingen in canton of Thurgau . The Bise arises when the air pressure in Güttingen is higher than in Geneva. In 563, according to the writings of Gregory of Tours and Marius Aventicensis , a tsunami wave swept along the lake, destroying the fort of Tauredunum and other settlements, and causing numerous deaths in Geneva. Simulations indicate that this Tauredunum event
10608-448: The earth's crust lifted up schist , gneiss and limestone rocks. These were destined to form the base of the Alps range, and this period of upheaval ended 300 million years ago. Granite intrusions and associated metamorphic rocks formed the base of the mountains we now call the Mont Blanc massif as well as the nearby Aiguilles Rouges . But these rocks were then heavily eroded away, eventually being ground down and inundated by
10744-500: The exact origins of the name are unknown, the name Lacus Lemanus was in use during the time of Julius Caesar . Lemannus comes from Ancient Greek Liménos Límnē ( Λιμένος Λίμνη ) meaning "port's lake". It became Lacus Lausonius , although this name was also used for a town or district on the lake, Lacus Losanetes , and then the Lac de Lausanne in the Middle Ages . Following
10880-523: The exception of criterion 3, the others have been accepted or elaborated upon by other hydrology publications. The majority of lakes on Earth are freshwater , and most lie in the Northern Hemisphere at higher latitudes . Canada , with a deranged drainage system , has an estimated 31,752 lakes larger than 3 square kilometres (1.2 sq mi) in surface area. The total number of lakes in Canada
11016-740: The first ascents, usually accompanied by guides from Chamonix or Courmayeur, such as Michel Croz , Michel Payot and Émile Rey , as well as the Swiss guide, Christian Almer . Across the massif there are now more than two thousand different mountaineering routes to the summits, ranging greatly in both length and difficulty. These attract climbers from all over the world who, unlike the early ascensionists, now have access to numerous climbing guidebooks, modern safety equipment, good information on climbing routes and technical difficulty, as well as weather forecasts and mountain accommodation and food. A wide range of glaciers and glacial structures can be found across
11152-409: The following species of flowering plants amongst rocky debris around permanent snow fields and the highest alpine glaciers: Achillea nana [ fr ] ; Achillea atrata ; Gentiana nivalis ; Juncus trifidus ; Ranunculus glacialis ; Saxifraga biflora [ de ] and Saxifraga oppositifolia . In the mid-1800s, Venance Payot , a Chamonix naturalist , published
11288-423: The glacier is now a cause of serious concern. The inexorable downward movement and melting of glaciers can result in objects lost within them reappearing many years later. The first recorded account of a body reappearing from a glacier in the Mont Blanc range was made by Viscount Edmond de Catelin in 1861. It concerned three alpine guides who were buried in a crevasse during an avalanche on 20 August 1820 near
11424-432: The highest point at 4,808 metres (15,774 ft). Whilst the Mont Blanc massif does not contain any species that are endemic to it, there are many rare and legally protected species found within its four major habitat zones. These are the: montane forests , sub-alpine, alpine and nival zones . The major habitats are coniferous forests , moors , rock and talus slopes , plus glacial moraines . The biological richness
11560-555: The highest point in western Europe and the European Union . Because of its considerable overall altitude, a large proportion of the massif is covered by glaciers , which include the Mer de Glace and the Miage Glacier – the longest glaciers in France and Italy, respectively. The massif forms a watershed between the vast catchments of the rivers Rhône and Po , and
11696-422: The hypolimnion is a transition zone known as the metalimnion . Finally, overlying the metalimnion is a surface layer of warmer water with a lower density, called the epilimnion . This typical stratification sequence can vary widely, depending on the specific lake or the time of year, or a combination of both. The classification of lakes by thermal stratification presupposes lakes with sufficient depth to form
11832-907: The intentional damming of rivers and streams, rerouting of water to inundate a previously dry basin , or the deliberate filling of abandoned excavation pits by either precipitation runoff , ground water , or a combination of both. Artificial lakes may be used as storage reservoirs that provide drinking water for nearby settlements , to generate hydroelectricity , for flood management , for supplying agriculture or aquaculture , or to provide an aquatic sanctuary for parks and nature reserves . The Upper Silesian region of southern Poland contains an anthropogenic lake district consisting of more than 4,000 water bodies created by human activity. The diverse origins of these lakes include: reservoirs retained by dams, flooded mines, water bodies formed in subsidence basins and hollows, levee ponds, and residual water bodies following river regulation. Same for
11968-466: The karst regions at the Dalmatian coast of Croatia and within large parts of Florida . A landslide lake is created by the blockage of a river valley by either mudflows , rockslides , or screes . Such lakes are most common in mountainous regions. Although landslide lakes may be large and quite deep, they are typically short-lived. An example of a landslide lake is Quake Lake , which formed as
12104-493: The lake level. Mont Blanc Massif The Mont Blanc massif ( French : Massif du Mont-Blanc ; Italian : Massiccio del Monte Bianco ) is a mountain range in the Alps , located mostly in France and Italy , but also straddling Switzerland at its northeastern end. It contains eleven major independent summits, each over 4,000 metres (13,123 ft) in height. It is named after Mont Blanc (4,808 metres (15,774 ft)),
12240-516: The lake originally extended, the shores are enclosed by comparatively high and bold mountains, and the vista terminates in the grand portal of the defile of St. Maurice , cleft to a depth of nearly 2,700 m (8,900 ft) between the opposite peaks of the Dents du Midi and the Dent de Morcles . The shore between Nyon and Lausanne is called La Côte because it is flatter. Between Lausanne and Vevey it
12376-550: The lake. The design of the Alinghi 5 , the defender of the 2010 America's Cup , was influenced by those racing catamarans. The best-known event, the Bol d'or [ fr ] (not to be confused with other events having the same name) runs from Geneva to the end of the lake and back. The Tour du Lac rowing event also takes place on Lake Geneva. Competitors row once around the entire lake, making this 160-kilometre (99 mi) event
12512-887: The landscape ground down and shaped the mountains and the valleys as seen today. Both the Mont Blanc massif, and the Aiguilles Rouges range to its north, now form part of the external zone of the Alps, effectively being the outermost layers of rock. The central granites make up Mont Blanc, the steep slopes of the Drus , the Grandes Jorasses and the Dent du Géant, and at the highest points are topped by schists, which are visible in places such as Grands Montets and near Mont Blanc's summit. The granite mountains around Chamonix have been eroded into steep needle-shaped peaks (known as aiguilles ). Known locally as protogine , these rocks are lower in
12648-648: The largest lakes on Earth are rift lakes occupying rift valleys, e.g. Central African Rift lakes and Lake Baikal . Other well-known tectonic lakes, Caspian Sea , the Sea of Aral , and other lakes from the Pontocaspian occupy basins that have been separated from the sea by the tectonic uplift of the sea floor above the ocean level. Often, the tectonic action of crustal extension has created an alternating series of parallel grabens and horsts that form elongate basins alternating with mountain ranges. Not only does this promote
12784-528: The layers of sediment at the bottom of a meromictic lake remain relatively undisturbed, which allows for the development of lacustrine deposits . In a holomictic lake, the uniformity of temperature and density allows the lake waters to completely mix. Based upon thermal stratification and frequency of turnover, holomictic lakes are divided into amictic lakes , cold monomictic lakes , dimictic lakes , warm monomictic lakes, polymictic lakes , and oligomictic lakes. Lake stratification does not always result from
12920-560: The level of a lake are controlled by the difference between the input and output compared to the total volume of the lake. Significant input sources are precipitation onto the lake, runoff carried by streams and channels from the lake's catchment area, groundwater channels and aquifers, and artificial sources from outside the catchment area. Output sources are evaporation from the lake, surface and groundwater flows, and any extraction of lake water by humans. As climate conditions and human water requirements vary, these will create fluctuations in
13056-773: The longest non-stop rowing regatta in the world. Several competitions for swimmers are organised yearly, the longest of which spans the length of the lake from Chillon Castle to Geneva (70km) and is known as The Signature . Other events include the crossing of the lake from Lausanne to Evian (13km), from Montreux to Clarens (1.8 km), in Geneva (1.8 km), all in summer, and the Coupe de Noël , 125m in Geneva in December. Canton of Valais (VS): Haute-Savoie : Canton of Vaud (VD): Haute-Savoie : VD: ( * Lac de Genève, see also Geography ) Haute-Savoie: Canton of Geneva (GE): VD: GE: Edmund Ludlow , famous as one who had signed
13192-409: The main valleys of the Alps . It is in the shape of a crescent, with the horns pointing south, the northern shore being 95 km (59 mi) and the southern shore 72 km (45 mi) in length. The crescent form was more regular in a recent geological period, when the lake extended to Bex , about 18 km (11 mi) south of Villeneuve. The detritus of the Rhône has filled up this portion of
13328-481: The mainland; lakes cut off from larger lakes by a bar; or lakes divided by the meeting of two spits. Organic lakes are lakes created by the actions of plants and animals. On the whole they are relatively rare in occurrence and quite small in size. In addition, they typically have ephemeral features relative to the other types of lakes. The basins in which organic lakes occur are associated with beaver dams, coral lakes, or dams formed by vegetation. Peat lakes are
13464-418: The massif's great overall height, a considerable proportion is permanently glaciated or snow-covered and is exposed to extremely cold conditions. Even on the high passes of the Tour du Mont Blanc, around 2,000 to 2,500 m (6,600 to 8,200 ft), summer temperatures can be between 5 and 15 °C (41 and 59 °F), but feeling much colder because of wind chill in windy or wet conditions. Precipitation
13600-403: The massif, from the valley bottoms right up to 3,800 m (12,500 ft) where the alpine chrysanthemum ( Leucanthemopsis alpina [ fr ] ) can be found at a record-breaking height. Early explorers, such as Alexander von Humboldt in 1807, observed a number of notable species in the mountains around Mont Blanc at altitudes above 3,100 metres (10,200 feet). This was well above
13736-612: The mid-way station of the Skyway Monte Bianco , or on foot from La Palud within two hours and an ascent of 800 m (2,600 ft). The botanical garden derives its name from the genus of mountain flowers, Saussurea (Saw-worts) which itself was named after Horace-Bénédict de Saussure , whose enthusiasm for scientific research in the mountains led to the first ascent of Mont Blanc in 1786. The mountains around Mont Blanc are home to many mammal species, including ibex, chamois , deer, mountain hare and alpine marmot (including
13872-449: The mineral biotite mica and richer in quartz than the granites commonly found elsewhere. A large part of the massif is covered by ice fields and is cut by numerous glaciers, mostly flowing northwestwards on the French side; southeastwards on the Italian side and eastwards on the Swiss side. With much steeper slopes on the Italian side, many glaciers drop very sharply and some, such as
14008-424: The mode of origin, lakes have been named and classified according to various other important factors such as thermal stratification , oxygen saturation, seasonal variations in lake volume and water level, salinity of the water mass, relative seasonal permanence, degree of outflow, and so on. The names used by the lay public and in the scientific community for different types of lakes are often informally derived from
14144-425: The modern Tour du Mont Blanc walking trail still follow the route of a Roman road along the Col du Bonhomme and the Col de la Seigne. The Romans occupied Martigny to the north of the massif, and their influence spread out well beyond the Alps into much of northern Europe. As a result of aggressive pressure from tribes in the north, the imperial forces of Rome were gradually withdrawn from the alpine regions until, by
14280-462: The months of November and April. The best weather for mountaineering or hiking occurs between late June to early October but, being the highest part of the Alps, the Mont Blanc massif can create its own weather patterns. Temperatures drop as the mountains gain in height, and the summit of Mont Blanc is a permanent ice cap, with temperatures around −20 °C (−4 °F). The summit is also prone to strong winds and sudden weather changes. Because of
14416-485: The moon Titan , which orbits the planet Saturn . The shape of lakes on Titan is very similar to those on Earth. Lakes were formerly present on the surface of Mars, but are now dry lake beds . In 1957, G. Evelyn Hutchinson published a monograph titled A Treatise on Limnology , which is regarded as a landmark discussion and classification of all major lake types, their origin, morphometric characteristics, and distribution. Hutchinson presented in his publication
14552-415: The morphology of the lakes' physical characteristics or other factors. Also, different cultures and regions of the world have their own popular nomenclature. One important method of lake classification is on the basis of thermal stratification, which has a major influence on the animal and plant life inhabiting a lake, and the fate and distribution of dissolved and suspended material in the lake. For example,
14688-406: The most numerous lakes in the world. Most lakes in northern Europe and North America have been either influenced or created by the latest, but not last, glaciation, to have covered the region. Glacial lakes include proglacial lakes , subglacial lakes , finger lakes , and epishelf lakes. Epishelf lakes are highly stratified lakes in which a layer of freshwater, derived from ice and snow melt,
14824-399: The mountains is facilitated by cable cars , mountain railways and mountain huts which offer overnight refuge to climbers and skiers. The long-distance Tour du Mont Blanc hiking trail circumnavigates the whole massif in an 11-day trek of 170 kilometres (110 mi). The Mont Blanc Tunnel connects the French town of Chamonix on the northern side with the Italian town of Courmayeur in
14960-416: The mountains of the Mont Blanc range to the attention of a wide audience for the first time. In 1760, Horace-Bénédict de Saussure offered a large financial prize to the first people who successfully ascended Mont Blanc. The summit was finally attained on 8 August 1786 by two Chamonix men, the guide Jacques Balmat and Dr. Michel Paccard . The decades that followed saw the gradual opening up of Chamonix to
15096-704: The name Alpes Penninae , or Poeninae , to the highest parts of the Alps—which extended from Mont Blanc to Monte Rosa . They took over Aosta from the Salassi Celtic tribe in 25 AD and engineered roads which extended northwards into Europe via the Great St Bernard Pass and the Little St Bernard Pass . Courmayeur, on the southern side of the massif, began to develop as a stop-off along their trans-alpine trading routes between Italy and France. Parts of
15232-791: The names include: Lakes may be informally classified and named according to the general chemistry of their water mass. Using this classification method, the lake types include: A paleolake (also palaeolake ) is a lake that existed in the past when hydrological conditions were different. Quaternary paleolakes can often be identified on the basis of relict lacustrine landforms, such as relict lake plains and coastal landforms that form recognizable relict shorelines called paleoshorelines . Paleolakes can also be recognized by characteristic sedimentary deposits that accumulated in them and any fossils that might be contained in these sediments. The paleoshorelines and sedimentary deposits of paleolakes provide evidence for prehistoric hydrological changes during
15368-478: The northern shore of the lake. Writer Vladimir Nabokov also took residence in Montreux, where he died in 1977. Former Formula 1 driver Michael Schumacher lives with his family in a home overlooking the lake. Lake A lake is an often naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land . Lakes lie completely on land and are separate from
15504-599: The northern side of the Swiss Alps . The climate of the Mont Blanc massif is cold and temperate ( Köppen climate classification Cfb ), and is greatly influenced by altitude. The main valley settlements around the perimeter of the massif are at an altitude ranging between 600 and 1,200 metres (2,000 and 3,900 ft). Daytime valley temperatures in July and August may range up to 25 °C (77 °F), sometimes reaching 30 °C (86 °F). The greatest snowfall occurs between
15640-562: The organic-rich deposits of pre-Quaternary paleolakes are important either for the thick deposits of oil shale and shale gas contained in them, or as source rocks of petroleum and natural gas . Although of significantly less economic importance, strata deposited along the shore of paleolakes sometimes contain coal seams . Lakes have numerous features in addition to lake type, such as drainage basin (also known as catchment area), inflow and outflow, nutrient content, dissolved oxygen , pollutants , pH , and sedimentation . Changes in
15776-497: The permanent snow line, but on rocks that were so steep that little snow could rest. These arctic-alpine species included: Androsace carnea [ es ] ; Androsace chamaejasme [ de ] ; Arabis caerulea [ de ] ; Cardamine bellidifolia ; Draba hirta ; Saxifraga androsacea [ es ] and Silene acaulis (occurring down to 1,500 m (4,900 ft)). Between 2,500 and 3,100 m (8,200 and 10,200 ft), Humboldt noted
15912-485: The public in 2006 and tells the story of the early crystal-hunters (known as cristalliers ). Many specimens collected from across the massif are displayed there. Located on the watershed between the Rhône and the Po , the Mont Blanc massif is also situated between the two different climatic regions of the northern and western Alps and that of the southern Alps. Climatic conditions on the Mer de Glace are similar to those found on
16048-425: The rise of Geneva it became Lac de Genève (translated into English as Lake Geneva ), but Le Léman was the common name on all local maps and is the customary name in the French language. In contemporary English , the name Lake Geneva has become predominant. Lake Geneva is divided into three parts because of its different types of formation (sedimentation, tectonic folding, glacial erosion): According to
16184-553: The sea, so allowing sedimentary rocks to form. Then, once again, this part of the Earth's crust was uplifted as a result of the collision of continental plates . The huge mountain ranges of today's Alps began to form. This happened towards the end of the Tertiary period, 15 million years ago. Finally, came the Quaternary era, when successive ice ages saw vast glaciers advance, retreat, and then advance again. Their movement across
16320-436: The site of one of two Air India plane crashes. These occurred at almost identical locations high up near the summit of Mont Blanc: one in 1950 ( Air India Flight 245 ), and one in 1966 ( Air India Flight 101 ). Debris from these crashes is still commonly found on the glacier below. The Mont Blanc massif consists predominantly of ancient granite rocks. The Alps have their origins 770 million years ago when upheaval of
16456-512: The slopes below les Courtes had yielded many large specimens. He recounted that in 1745 a guide had stated he had collected over 300 pounds (136 kg) of specimens there in just three hours. The first systematic account of the minerals of the Mont Blanc area was published in 1873 by Venance Payot. His list, entitled "Statistique minéralogique des environs du Mt-Blanc", catalogued 90 mineral types although it also included those present only as very small components of rocks. If these are excluded, it
16592-664: The south side, the mountains of Savoy and Valais are for the most part rugged and sombre, while those of the northern shore fall in gentle vine-covered slopes, thickly set with villages and castles. The snowy peaks of the Mont Blanc Massif are shut out from the western end of the lake by the Voirons mountain, and from its eastern end by the bolder summits of the Grammont , Cornettes de Bise , and Dent d'Oche , but are seen from Geneva, and between Nyon and Morges . From Vevey to Bex, where
16728-432: The south. The high mountains have provided many opportunities for scientific research, including neutrino measurements within the tunnel and impact of climate change on its highest slopes. Recent rises in average temperatures have led to significant glacial retreat across the massif and an awareness of the need for better environmental protection, including a call for World Heritage Site status. The Mont Blanc massif
16864-488: The summit of Mont Dolent at an altitude of 3,820 metres (12,533 ft). From here the French – Italian border runs southwestwards along a ridge of high summits on the southern side of the massif, many of which are over 4,000 metres (13,123 ft) in height, including the Grandes Jorasses , Rochefort Ridge , Dent du Géant , Mont Maudit , Mont Blanc and its western satellite, the Aiguille de Bionnassay . From here
17000-584: The summit of Mont Blanc) precipitation is considerably less, with only around 1,100 mm (43 in) recorded, despite the latter measurements being taken at a height of 4,300 metres (14,100 ft). In the mountains further south of the Mont Blanc range, annual precipitation is significantly less than at equivalent altitudes within the massif. For example, the valleys in the Pelvoux massif at around 1,000 metres (3,300 ft) receive only around 600 to 700 mm (24 to 28 in) of precipitation per year, which
17136-404: The thermal stratification, as well as the degree and frequency of mixing, has a strong control over the distribution of oxygen within the lake. Professor F.-A. Forel , also referred to as the "Father of limnology", was the first scientist to classify lakes according to their thermal stratification. His system of classification was later modified and improved upon by Hutchinson and Löffler. As
17272-456: The times that they existed. There are two types of paleolake: Paleolakes are of scientific and economic importance. For example, Quaternary paleolakes in semidesert basins are important for two reasons: they played an extremely significant, if transient, role in shaping the floors and piedmonts of many basins; and their sediments contain enormous quantities of geologic and paleontologic information concerning past environments. In addition,
17408-421: The twin passes of Col Ferret. The massif contains 11 main summits over 4,000 metres (13,123 ft) in altitude, as well as numerous subsidiary points above this height. Crowning the massif is Mont Blanc (4,808 metres (15,774 ft)), the highest mountain in the Alps and in western Europe. From the summit of Mont Blanc to the Arve near Chamonix there is a 3,800 metres (12,500 ft) drop in altitude over
17544-641: The two. Lakes are also distinct from lagoons , which are generally shallow tidal pools dammed by sandbars or other material at coastal regions of oceans or large lakes. Most lakes are fed by springs , and both fed and drained by creeks and rivers , but some lakes are endorheic without any outflow, while volcanic lakes are filled directly by precipitation runoffs and do not have any inflow streams. Natural lakes are generally found in mountainous areas (i.e. alpine lakes ), dormant volcanic craters , rift zones and areas with ongoing glaciation . Other lakes are found in depressed landforms or along
17680-537: The west it is bounded by the Val Montjoie, containing Les Contamines-Montjoie and the river Le Bon Nant which flows northwards to a confluence with the Arve near Saint-Gervais-les-Bains , and onwards to the Rhône . The southern side of the massif lies mostly within Italy and is bounded by the Val Veny and Val Ferret whose watercourses meet just above Courmayeur . From Courmayeur these waters flow southwards as
17816-462: The word pond , and a lesser number of names ending with lake are, in quasi-technical fact, ponds. One textbook illustrates this point with the following: "In Newfoundland, for example, almost every lake is called a pond, whereas in Wisconsin, almost every pond is called a lake." One hydrology book proposes to define the term "lake" as a body of water with the following five characteristics: With
17952-416: The world, as well as the rest of the Mont Blanc massif. The many published accounts of climbs and impressive sights amongst or around the mountain range attracted numerous wealthy and notable visitors, for whom a visit to marvel at the Sea of Ice (the Mer de Glace) became a fashionable thing to experience. In July 1816, Mary Shelley and Percy Bysshe Shelley toured the Alps and visited Chamouni (as it
18088-428: Was inspired by the river Arve, the snow-covered summits, the chaotic glaciers and the forests that he experienced during their visit. Far, far above, piercing the infinite sky, Mont Blanc appears—still, snowy, and serene— Its subject mountains their unearthly forms Pile around it, ice and rock; broad vales between Of frozen floods, unfathomable deeps, Blue as the overhanging heaven, that spread And wind among
18224-475: Was most likely caused by a massive landslide near the Rhône delta, which caused a wave eight metres (26 ft) high to reach Geneva within 70 minutes. In 888, the town was part of the new Kingdom of Burgundy , and, with it, was absorbed into the Holy Roman Empire in 1033. In the late 1960s, pollution made it dangerous to swim at some beaches of the lake; indeed, visibility underwater was near zero. By
18360-611: Was originally a shallow natural lake and an example of a lake basin dammed by wind-blown sand. China's Badain Jaran Desert is a unique landscape of megadunes and elongated interdunal aeolian lakes, particularly concentrated in the southeastern margin of the desert. Shoreline lakes are generally lakes created by blockage of estuaries or by the uneven accretion of beach ridges by longshore and other currents. They include maritime coastal lakes, ordinarily in drowned estuaries; lakes enclosed by two tombolos or spits connecting an island to
18496-535: Was then known), as well as the Mer de Glace and the Bossons Glacier. They jointly published their accounts and letters in a work entitled: History of a Six Weeks' Tour through a part of France, Switzerland, Germany, and Holland; with Letters Descriptive of a Sail Round the Lake of Geneva and of the Glaciers of Chamouni . The book concludes with Mont Blanc , a 144-line poem by Percy Shelley, written whilst in Chamonix and which
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