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106-594: It is located at the north foot of the Rila mountain15 km east of Dupnitsa . The town is known for its hot mineral (103 °C (217 °F)) and clear mountain water, as well as the geyser in the town centre that sprang forth in 1957. The former Roman town of Germania (in Dacia) or Germane once stood at the location of modern Sapareva Banya and in the 3rd century was an important town in Dacia province. This, or possibly Germen ,

212-638: A pH as low as 0.8, to alkaline chloride springs saturated with silica , to bicarbonate springs saturated with carbon dioxide and carbonate minerals . Some springs also contain abundant dissolved iron. The minerals brought to the surface in hot springs often feed communities of extremophiles , microorganisms adapted to extreme conditions, and it is possible that life on Earth had its origin in hot springs. Humans have made use of hot springs for bathing, relaxation, or medical therapy for thousands of years. However, some are hot enough that immersion can be harmful, leading to scalding and, potentially, death. There

318-438: A 3.48 billion year old geyserite that seemingly preserved fossilized microbial life, stromatolites, and biosignatures. Researchers propose pyrophosphite to have been used by early cellular life for energy storage and it might have been a precursor to pyrophosphate. Phosphites, which are present at hot springs, would have bonded together into pyrophosphite within hot springs through wet-dry cycling. Like alkaline hydrothermal vents,

424-401: A complex community of microorganisms that includes Spirulina , Calothrix , diatoms and other single-celled eukaryotes , and grazing insects and protozoans. As temperatures drop close to those of the surroundings, higher plants appear. Alkali chloride hot springs show a similar succession of communities of organisms, with various thermophilic bacteria and archaea in the hottest parts of

530-463: A distance of 810 km from the nearest point of the same elevation. With a prominence of 2,473 m, Musala ranks seventh among Europe's ultra-prominent peaks . The mountain range is divided into four distinct parts. East Rila, known also as Musala Rila, is the largest and highest subdivision, situated between the valleys of the rivers Beli Iskar and Belishka. It is formed of two main ridges. The Musala Ridge spans in north–south direction between

636-487: A five-domed church, a defensive tower and monastic apartments encircling an inner yard. The exterior of the complex resembles a fortress with its high stone walls and little windows. The oldest surviving structure is the 23 m high Hrelyo's Tower, constructed in 1334–1335. The Church of Theodore Tyro and Theodore Stratelates in Dobarsko at an elevation of about 1,000 m is a small three-naved stone basilica half dug into

742-408: A form of opal (opal-A: SiO 2 ·nH 2 O ). This process is slow enough that geyserite is not all deposited immediately around the vent, but tends to build up a low, broad platform for some distance around the spring opening. Acid sulfate hot springs are fed by hydrothermal fluids rich in hydrogen sulfide ( H 2 S ), which is oxidized to form sulfuric acid , H 2 SO 4 . The pH of

848-474: A hot spring. However, even in areas that do not experience volcanic activity, the temperature of rocks within the earth increases with depth. The rate of temperature increase with depth is known as the geothermal gradient . If water percolates deeply enough into the crust, it will be heated as it comes into contact with hot rock. This generally takes place along faults , where shattered rock beds provide easy paths for water to circulate to greater depths. Much of

954-504: A number of glacial lake groups, including Musala Lakes and Marichini Lakes , as well as the nation's largest ski resort Borovets . Central Rila, known also as Skakavitsa Rila, is the smallest part spanning 9% of the Rila's total area but has the most Alpine character and the highest average elevation — 2,077 m. It stretches between the valleys of the rivers Beli Iskar, Cherni Iskar, Levi Iskar, Iliyna and Rilska . The later divides

1060-424: A range of possible hot spring chemistries. Alkaline chloride hot springs are fed by hydrothermal fluids that form when groundwater containing dissolved chloride salts reacts with silicate rocks at high temperature. These springs have nearly neutral pH but are saturated with silica ( SiO 2 ). The solubility of silica depends strongly upon temperature, so upon cooling, the silica is deposited as geyserite ,

1166-418: A slow process of thermal conduction , but in volcanic areas, the heat is carried to the surface more rapidly by bodies of magma. A hot spring that periodically jets water and steam is called a geyser . In active volcanic zones such as Yellowstone National Park , magma may be present at shallow depths. If a hot spring is connected to a large natural cistern close to such a magma body, the magma may superheat

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1272-475: A source of energy. In contrast with " black smokers " (hydrothermal vents on the ocean floor), hot springs similar to terrestrial hydrothermal fields at Kamchatka produce fluids having suitable pH and temperature for early cells and biochemical reactions. Dissolved organic compounds were found in hot springs at Kamchatka . Metal sulfides and silica minerals in these environments would act as photocatalysts. They experience cycles of wetting and drying which promote

1378-469: A spring with water between 20 and 50 °C (68 and 122 °F). Water issuing from a hot spring is heated geothermally , that is, with heat produced from the Earth's mantle . This takes place in two ways. In areas of high volcanic activity, magma (molten rock) may be present at shallow depths in the Earth's crust . Groundwater is heated by these shallow magma bodies and rises to the surface to emerge at

1484-417: A type of extremophile that thrives at high temperatures, between 45 and 80 °C (113 and 176 °F). Further from the vent, where the water has had time to cool and precipitate part of its mineral load, conditions favor organisms adapted to less extreme conditions. This produces a succession of microbial communities as one moves away from the vent, which in some respects resembles the successive stages in

1590-463: Is 15,5 mg / L. It is claimed that the water treats disorders of the musculoskeletal system, nervous system, and upper respiratory tract, and metal poisoning. Rila Rila ( Bulgarian : Рила , pronounced [ˈriɫɐ] ) is the highest mountain range of Bulgaria, the Balkan Peninsula , and Southeast Europe . It is situated in southwestern Bulgaria and forms part of

1696-532: Is 2,560 m while the lowest is 1,300 m. Over 36,000 foreign tourists have stayed in Borovets for the 2016/17 winter season spending an average of five nights. Other much smaller ski resorts include Panichishte with several ski runs, Semkovo with seven ski runs totaling 4 km, Bodrost with 5 km ski runs and Govedartsi with a single 1.7 km ski run. The Balmeken High Mountain Sports Complex

1802-685: Is 2.6 °C on the northern slopes and 3.1 °C on the southern. With an average annual temperature of −3.0 °C, Musala is the coldest place in Bulgaria. The lowest absolute temperature in Rila was also measured there: −31.2 °C; the lowest mean monthly temperature was recorded there in February: −11.6 °C. The absolute maximum temperature at Musala is 18.7 °C. Temperature amplitude decreases with elevation from 20 °C at 800 m to 15 °C at 2,800 m. Temperature inversions , i.e. increase in temperature with height, are frequent on

1908-627: Is Mount Golyiam Kupen at an elevation of 2731 m. There are 29 peaks over 2,100 m. This subdivision is known for its rugged peaks and picturesque lakes in the Alpine zone that include the Seven Rila Lakes and the Urdini Lakes . Central Rila includes the mountain's highest waterfall, Skakavitsa (70 m). Southwest Rila stretches between the valleys of the Rilska, Iliyna and Belishka rivers to

2014-447: Is a spring produced by the emergence of geothermally heated groundwater onto the surface of the Earth. The groundwater is heated either by shallow bodies of magma (molten rock) or by circulation through faults to hot rock deep in the Earth's crust . Hot spring water often contains large amounts of dissolved minerals. The chemistry of hot springs ranges from acid sulfate springs with

2120-411: Is also influenced by the terrain, the exposure of the slopes and the orientation of the valleys. The average temperature decreases and the average precipitation increases with elevation. The coldest month is March and the hottest one August. Negative temperatures remain on average for about nine months in the Alpine zone, often continuing until the end of June. A steady rise in temperature is observed in

2226-673: Is built up predominantly by granite. It is covered by a thick layer of crystalline schists and granite– gneiss ; this layer is topped by sandstones and conglomerates which were formed by elevated Tertiary sediments. Traces of these sediments are found in the Northwest Rila at an elevation of up to 1,900 m. The highest zones are made mainly of granite, and below are crystalline schists, whose compound minerals are sequentially deposited. They are represented by gneiss, mica schists, and amphibolite . In many places granite passes into granite–gneiss. There are marbles and amphibolites formed in

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2332-415: Is closely linked to the snowline during the last glacial period and most of them lie at elevations between 2,100 m and 2,500 m. Most lakes (28) are situated at elevations between 2,300 m and 2,350 m; there are 23 between 2,350 m and 2,400 m, 19 between 2,250 m and 2,300 m and 19 between 2,400 m and 2,450 m. Their length varies between 800 m and 20 m,

2438-458: Is covered by dwarf mountain pine ( Pinus mugo ) and common juniper ( Juniperus communis ) formations mixed with green alder ( Alnus viridis ) at wetter localities and Rhododendron myrtifolium in East Rila. The alpine line is covered with grass, moss, lichen, rare flowers, dwarf willows such as Salix herbacea , Salix retusa and Salix reticulata , etc. Due to the difficult terrain,

2544-479: Is covered with microbial mats 1 centimetre (0.39 in) thick that are dominated by cyanobacteria , such as Spirulina , Oscillatoria , and Synechococcus , and green sulfur bacteria such as Chloroflexus . These organisms are all capable of photosynthesis , though green sulfur bacteria produce sulfur rather than oxygen during photosynthesis. Still further from the vent, where temperatures drop below 45 °C (113 °F), conditions are favorable for

2650-690: Is determined by the elevation. At the lowest portions there are xerothermal oak forests dominated by Hungarian oak ( Quercus frainetto ), pubescent oak ( Quercus pubescens ) and Austrian oak ( Quercus cerris ) with some Mediterranean cenosis of cade juniper ( Juniperus oxycedrus ) and scorpion senna ( Hippocrepis emerus ). Higher in the mountain up to 1,300 m the deciduous forests are primarily of sessile oak ( Quercus petraea ) with smaller participation of European hop-hornbeam ( Ostrya carpinifolia ), common hornbean ( Carpinus betulus ), Heldreich's maple ( Acer heldreichii ), Balkan maple ( Acer hyrcanum ) and European ash ( Fraxinus excelsior );

2756-592: Is dotted with almost 200 glacial lakes such as the renowned Seven Rila Lakes , and is rich in hot springs in the fault areas at the foothills, including the hottest spring in South-eastern Europe in Sapareva Banya . The mountain range has varied flora and fauna with a number of endemic and relict species and some of the best preserved forests in the country. The biodiversity and the pristine landscapes are protected by Rila National Park which covers much of

2862-464: Is expected to rise to over 7000; of them 34 are endemic to Rila, 123 — to Bulgaria and another 123 — to the Balkans. The biodiversity, ecosystems and the pristine landscapes are protected by Rila National Park declared in 1992, which is Bulgaria's largest spanning a territory of 810.46 km , and Rila Monastery Nature Park covering another 252.535 km . There are four nature reserves in

2968-464: Is in autumn and winter. The largest waterfalls are Skakavitsa (70 m) and Goritsa (39 m). There are abundant mineral springs that include the hottest one in South-eastern Europe at Sapareva Banya forming a geyser with a temperature of 101.4 °C. The cirques at the high elevation zone contain 189 glacial lakes; there are also about 30 smaller ones that evaporate in summer, including tectonic lakes like Panichishte. Their location

3074-473: Is located at an elevation of 2,050 m in East Rila and is used for training, medical and biological research by athletes but also provides opportunities for family recreation. The mountain range was a favourite place of retreat for the Bulgarian monarchs Ferdinand I (r. 1887–1918) and his son Boris III (r. 1918–1943). The palace of Tsarska Bistritsa was constructed between 1898 and 1914 above Borovets in

3180-410: Is no universally accepted definition of a hot spring. For example, one can find the phrase hot spring defined as The related term " warm spring " is defined as a spring with water temperature less than a hot spring by many sources, although Pentecost et al. (2003) suggest that the phrase "warm spring" is not useful and should be avoided. The US NOAA Geophysical Data Center defines a "warm spring" as

3286-624: Is served by the Bulgarian State Railways via railway line No. 1 in the north-east with stations at Kostenets and Belovo, railway line No. 5 along the Struma Valley in the west and the Septemvri–Dobrinishte narrow-gauge line in the south-east. The most important sectors of the local economy are tourism, services, industry and agriculture. The abundant water resources are utilised by some of Bulgaria's largest hydro power plants,

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3392-573: Is situated between the valleys of Rilska to the south, Levi Iskar to the east, Samokov to the north-east and Dupnitsa to the west. Its much lower northern section is called Lakatitska Rila. It is linked with the Verila mountain range to the north through the Klisura Saddle, and with Central Rila to the east through the Kobilino Branishte saddle. The average elevation is 1,556 m; the highest summit

3498-543: Is the oldest winter resort in Bulgaria and the largest one in Rila. It has 27 marked ski runs with a total length of 58 km equipped with 12 lifts facilities and provides conditions for alpine skiing , cross-country skiing , night skiing , biathlon , snowboard , etc.; it has hosted competitions in the FIS Alpine Ski World Cup and the Biathlon World Championships 1993 . The top elevation

3604-568: The Homeric Age of Greece (ca. 1000 BCE), baths were primarily for hygiene, but by the time of Hippocrates (ca. 460 BCE), hot springs were credited with healing power. The popularity of hot springs has fluctuated over the centuries since, but they are now popular around the world. Because of both the folklore and the claimed medical value attributed to some hot springs, they are often popular tourist destinations, and locations for rehabilitation clinics for those with disabilities . However,

3710-616: The Paleozoic over 250 million years ago and subsequently elevated during the Tertiary period. The coarse–grained granites are the dominant rocks forming almost two–thirds of the area of the Rila's higher parts. Rila was subjected to glaciation during the Pliocene and the Pleistocene . Its modern Alpine relief was formed during the last Würm glaciation some 10–12 000 years ago, when the snowline of

3816-608: The river of the same name , which comes from the Old Bulgarian verb "рыти" meaning "to grub". Rila has abundant water resources. Some of the Balkans' longest and deepest rivers originate from Rila, including the Maritsa , Iskar and Mesta rivers. Bulgaria's main water divide separating the Black Sea and the Aegean Sea drainage systems follows the main ridge of Rila. The mountain range

3922-672: The 120 are nesting within Rila National Park. These include three relicts — boreal owl , Eurasian pygmy owl and Eurasian three-toed woodpecker , and species that require special conservation measures like short-toed snake eagle , golden eagle , peregrine falcon , black stork , Eurasian woodcock , western capercaillie , hazel grouse , rock partridge , grey-headed woodpecker , black woodpecker , white-throated dipper , wallcreeper and Alpine chough among others. There are 18 reptile, 10 amphibian and 12 fish species. The invertebrate fauna discovered so far includes 4186 species and

4028-509: The 17–19 centuries due to production of iron and has a number of monuments, including churches, a convent, a 17th-century Ottoman drinking fountain and a museum of history. Near Belchin is located the recently restored Tsari Mali Grad Fortress. Rila Point on Livingston Island in the South Shetland Islands , Antarctica is named after Rila Mountain. Hot spring A hot spring , hydrothermal spring , or geothermal spring

4134-633: The 18th-century St George's Church from the Bulgarian National Revival and the Forty Martyrs Church from 1859 are located in Sapareva Banya. Mineral water of Separeva banya was highly regarded and used as a cure by Thracians and Romans. Saparevian mineral water is clear, colorless, with smell of hydrogen sulfide , hyperthermal (temperature 103 °C), hydrocarbonate, sulphate-sodium, fluorine, silicon and sulphide. Hydrogen sulfide

4240-483: The Alpine character of the other three subdivisions. The biosphere reserve Parangalitsa is situated there. Rila is a fault-block mountain and represents a crescent-shaped horst with two fault systems — concentric and radial. It is part of the oldest land in the Balkans, the Macedonian–Thracian Massif. The mountain range is formed mainly by metamorphic and intrusive rocks . The core of Rila

4346-551: The Balkan area. Established in the First Bulgarian Empire by the medieval Bulgarian hermit and saint John of Rila during the reign of emperor Peter I of Bulgaria (r. 927–969), the monastery developed into one of the main cradles of Bulgarian culture, literature and spirituality. In the 18th century it became one of the main hubs of the Bulgarian National Revival . The complex covers an area of 8,800 m and consists of

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4452-626: The Balkans separating the drainage basins of the Black Sea and the Aegean Sea passes through Rila's northern ridge, including the summit of Musala. Some of the Balkans' longest rivers originate from Rila, including the Maritsa , Iskar and Mesta , as well as several important tributaries of the Struma  — Rilska , Dzherman and Blagoevgradska Bistritsa . Of them, the Iskar and its tributaries belong to

4558-475: The Balkans. Rila accounts for 6% of Bulgaria's timber resources. Manufacturing industry is centred in Blagoevgrad, Dupnitsa, Samokov, Razlog and Belovo; the main sectors are food processing, machine building, pharmaceutical and paper mills. Rila is a popular tourist destination for winter sports, spa tourism, recreation and cultural tourism. Borovets , situated on the northern slopes at 9 km from Samokov,

4664-640: The Balkans; 31 are Tertiary or pre-glacial relicts and 104 are glacial relicts. Notable Bulgarian endemic species include Rila primrose ( Primula deorum ) and rhapontic rhubarb ( Rheum rhaponticum ); taxa restricted to the Balkans include Bulgarian avens ( Geum bulgaricum ), yellow columbine ( Aquilegia aurea ), Bulgarian gentian ( Gentianella bulgarica ), Balkanian butterwort ( Pinguicula balcanica ), Crocus veluchensis , Dianthus microlepis , etc. The non-vascular flora includes 974 algae , 313 moss and 251 lichen species. The fungi are represented by 665 species, including 64 mushrooms listed in

4770-477: The Black Sea drainage basins, and all the rest — to the Aegean. About 78% of the water flows into the Aegean drainage system. The runoff comes from snowmelt in the Alpine zones and rainfall. Water discharge reaches its maximum in late spring and early summer with spring accounting for more than half of the total annual discharge. The maximum at the highest elevations is in summer due to the late snowmelt. The minimum

4876-495: The Hakuba Happo hot spring goes through serpentinization, suggesting methanogenic microbial life possibly originated in similar habitats. A problem with the hot spring hypothesis for an origin of life is that phosphate has low solubility in water. Pyrophosphite could have been present within protocells, however all modern life forms use pyrophosphate for energy storage. Kee suggests that pyrophosphate could have been utilized after

4982-546: The Late Heavy Bombardment would not have caused cratering on Earth as they would produce fragments upon atmospheric entry. The meteors are estimated to have been 40 to 80 meters in diameter however larger impactors would produce larger craters. Metabolic pathways have not yet been demonstrated at these environments, but the development of proton gradients might have been generated by redox reactions coupled to meteoric quinones or protocell growth. Metabolic reactions in

5088-463: The Red Book of Bulgaria. The mammal species within Rila National Park and its surroundings are 62 and include taxa of high conservation value, such as brown bear , gray wolf , wildcat , least weasel , European pine marten , marbled polecat , wild boar , red deer , roe deer , chamois , European ground squirrel , as well as the glacial relict European snow vole . The bird species are 156; of

5194-775: The Rila– Rhodope Massif. The highest summit is Musala at an elevation of 2,925 m which makes Rila the sixth highest mountain range in Europe after the Caucasus , the Alps , Sierra Nevada , the Pyrenees and Mount Etna , and the highest one between the Alps and the Caucasus. It spans a territory of 2,629 km with an average elevation of 1487 m. The mountain is believed to have been named after

5300-724: The Wood-Ljungdahl pathway and reverse Krebs cycle have been produced in acidic conditions and thermophilic temperatures in the presence of metals which is consistent with observations of RNA mostly stable at acidic pH. Hot springs have been enjoyed by humans for thousands of years. Even macaques are known to have extended their northern range into Japan by making use of hot springs to protect themselves from cold stress. Hot spring baths ( onsen ) have been in use in Japan for at least two thousand years, traditionally for cleanliness and relaxation, but increasingly for their therapeutic value. In

5406-409: The biggest and most complex hydroelectric complex in Bulgaria, with a combined installed capacity of 1,599 MW. At an elevation of 1,900 m is located the second biggest reservoir in Rila, Beli Iskar , constructed between 1939 and 1945, that provides 25% of Sofia's potable water and powers a small 16 MW hydro power station. At an elevation of 2,394 m, Kalin is the highest reservoir in

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5512-520: The emergence of enzymes. Dehydrated conditions would favor phosphorylation of organic compounds and condensation of phosphate to polyphosphate. Another problem is that solar ultraviolet radiation and frequent impacts would have inhibited habitability of early cellular life at hot springs, although biological macromolecules might have undergone selection during exposure to solar ultraviolet radiation and would have been catalyzed by photocatalytic silica minerals and metal sulfides. Carbonaceous meteors during

5618-408: The evolution of early life. For example, in a bicarbonate hot spring, the community of organisms immediately around the vent is dominated by filamentous thermophilic bacteria , such as Aquifex and other Aquificales , that oxidize sulfide and hydrogen to obtain energy for their life processes. Further from the vent, where water temperatures have dropped below 60 °C (140 °F), the surface

5724-400: The fault lines along the northern foothills of Rila favour health and spa tourism. The most significant spa resorts from west to east are Sapareva Banya with a total discharge of 33 L/sec and temperature of 33–101.4 °C, Belchinski Bani with a total discharge of 24 L/sec and temperature of 40–41.5 °C, Dolna Banya with a total discharge of 22 L/sec and temperature of 56.3 °C and

5830-555: The fluids is thereby lowered to values as low as 0.8. The acid reacts with rock to alter it to clay minerals , oxide minerals , and a residue of silica. Bicarbonate hot springs are fed by hydrothermal fluids that form when carbon dioxide ( CO 2 ) and groundwater react with carbonate rocks . When the fluids reach the surface, CO 2 is rapidly lost and carbonate minerals precipitate as travertine , so that bicarbonate hot springs tend to form high-relief structures around their openings. Iron-rich springs are characterized by

5936-436: The following incumbents, so far of the fitting Episcopal (lowest) rank : Sapareva Banya is also the seat of Sapareva Banya municipality (part of Kyustendil Province), which includes the following 3 villages: According to the latest Bulgarian census of 2011, the religious composition, among those who answered the optional question on religious identification, was the following: The 12th-13th-century St Nicholas Church ,

6042-560: The foothills, inhabited by c. 250,000 people. Administratively it falls in four of Bulgaria's 28 provinces: Blagoevgrad , Kyustendil , Sofia and Pazardzhik . From west to east there are five towns at the northern foothills — Sapareva Banya (pop. 3,815 as of 2016), Samokov (25,880), Dolna Banya (4,510), Kostenets (6,228) and Belovo (3,533); there are four towns at the western foothills (from north to south) — Dupnitsa (35,255), Rila (2,359), Kocherinovo (1,723) and Blagoevgrad (66,886); as well as three more at

6148-399: The forests of Rila are not much influenced by anthropogenic activities and their average age is above 100 years. Some Norway spruces and European silver firs reach height of 60 m. The number of vascular plants includes about 1400 species registered only within the territory of Rila National Park, of them 34 are endemic to Bulgaria, including three restricted to Rila, and 89 — to

6254-522: The formation of biopolymers which are then encapsulated in vesicles after rehydration. Solar UV exposure to the environment promotes synthesis to monomeric biomolecules. The ionic composition and concentration of hot springs (K, B, Zn, P, O, S, C, Mn, N, and H) are identical to the cytoplasm of modern cells and possibly to those of the LUCA or early cellular life according to phylogenomic analysis. For these reasons, it has been hypothesized that hot springs may be

6360-469: The former — Parangalitsa , Central Rila Reserve , Ibar and Skakavitsa , and another one, Rila Monastery Forest , in the latter. Parangalitsa was declared a UNESCO Biosphere Reserve in 1977, while the Central Rila Reserve is the largest one in the Balkans with an area of 123.937 km . Rila is a sparsely populated mountain range with most of the settlements located in the valleys at

6466-432: The ground, constructed in 1614 and painted in 1672. The church is noted for its abundance of original frescoes and icons. The Church of Saint Nicholas in Sapareva Banya is small medieval edifice, constructed anytime from the 11th to the 14th century. It was built using red bricks and white mortar and is of a simple cross-in-square design, with a single nave and apse. The town of Samokov achieved economic prosperity during

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6572-629: The groundwater originates as rain and snow ( meteoric water ) falling on the nearby mountains, which penetrates a particular formation ( Hollis Quartzite ) to a depth of 3,000 feet (910 m) and is heated by the normal geothermal gradient. Because heated water can hold more dissolved solids than cold water, the water that issues from hot springs often has a very high mineral content, containing everything from calcium to lithium and even radium . The overall chemistry of hot springs varies from alkaline chloride to acid sulfate to bicarbonate to iron-rich , each of which defines an end member of

6678-400: The heat is created by decay of naturally radioactive elements. An estimated 45 to 90 percent of the heat escaping from the Earth originates from radioactive decay of elements mainly located in the mantle. The major heat-producing isotopes in the Earth are potassium-40 , uranium-238 , uranium-235 , and thorium-232 . In areas with no volcanic activity, this heat flows through the crust by

6784-669: The high concentrations of ionic solutes there would inhibit the formation of membranous structures. David Deamer and Bruce Damer note that these hypothesized prebiotic environments resemble Charles Darwin 's imagined "warm little pond". If life did not emerge at deep sea hydrothermal vents, rather at terrestrial pools, extraterrestrial quinones transported to the environment would generate redox reactions conducive to proton gradients. Without continuous wet-dry cycling to maintain stability of primitive proteins for membrane transport and other biological macromolecules, they would go through hydrolysis in an aquatic environment. Scientists discovered

6890-744: The highest lakes. The largest glacial lake in Rila and in the Balkans is Smradlivo with an area of 212 decares; the longest is the Upper Ribno Lake reaching 801 m; the deepest is Okoto, one of the Seven Rila Lakes with a depth of 37.5 m; the highest is Ledeno at an elevation of 2,709 m; the lowest is Suho at 2,045 m. The most important lake groups are the Seven Rila Lakes (seven lakes), Musala Lakes (seven), Marichini Lakes (seven), Urdini Lakes (six), Malyovishki Lakes (three), Elenski Lakes (three), Chanakgyolski Lakes (two), Vapski Lakes (two), etc. The vegetation

6996-646: The highest peaks are: Rila is situated in the southern zone of the humid continental climate region and has typical Alpine climate with elevational zones. The climate is influenced by the Icelandic and the West Mediterranean cyclones , the former mainly in late spring and early summer, and the latter — in winter, bringing frequent and high rainfall, as well as by the Azores and Siberian anticyclones in summer and winter, bringing droughts. The local microclimate

7102-654: The highest sections of the mountain with an elevation between 2,800 and 2,400 m. It represents practically leveled terrain with gently folded surface, formed in the place of ancient forest massifs. The next Late Miocene level, the young Miocene, is situated on the main side ridges with an elevation between 2,600 and 2,300 m. The third level formed during the Early Pliocene has an elevation of 1,800 and 1,600 m. The Late Pliocene level occupies areas with an elevation of up to 1,300 m. There are two summits above 2,900 m, Musala and Malka Musala . Some of

7208-407: The hot spring. It is common practice that bathers should wash before entering the water so as not to contaminate the water (with/without soap). In many countries, like Japan, it is required to enter the hot spring with no clothes on, including swimwear. Often there are different facilities or times for men and women, but mixed onsen do exist. In some countries, if it is a public hot spring, swimwear

7314-414: The hot spring. This leads to a runaway condition in which a sizable amount of water and steam are forcibly ejected from the hot spring as the cistern is emptied. The cistern then refills with cooler water, and the cycle repeats. Geysers require both a natural cistern and an abundant source of cooler water to refill the cistern after each eruption of the geyser. If the water supply is less abundant, so that

7420-405: The influx of warm Mediterranean air masses. Winds may reach speed of 40–45 m/s (over 100 km/h) at the summits, with mostly south-western and western orientation. The north-west and north-east winds are more moderate. The average monthly wind speed on the highest mountain summits reaches 11–12 m/s. In the lower parts, the average monthly speed varies from 1.2 to 2.5 m/s and in

7526-408: The largest and most complex hydroelectric complex in Bulgaria. Rila is a mountain range in south-western Bulgaria, part of the Rila– Rhodope Massif. It is situated between five valleys – Dupnitsa Valley to the north-west, Samokov Valley to the north, Kostenets–Dolna Banya Valley to the north-east, Razlog Valley to the south and Blagoevgrad Valley to the south-west. Five saddles link Rila to

7632-578: The main ones. The bottom of cirques are often occupied by glacial lakes . As a result of the weathering , scree formations of varied nature have been accumulated. In the south-western foothills of Rila the Stob Earth Pyramids were formed under the influence of erosion. The staged elevation of the mountain during the geological eras and the large range of vertical folds have led to the formation of four denudation levels of distinct age, height and range. The oldest Early Miocene level encompasses

7738-413: The massif. In the west along the Struma Valley runs Struma motorway paralleled by the first class I-1 road , both part of European route E79 , that connect the national capital Sofia and Greece via the provincial centre Blagoevgrad . The second class II-62 road branches off I-1 at Dupnitsa and runs east to Samokov where it joins the second class II-82 road which continues in eastern direction until

7844-462: The middle and end of July. Even during the summer months, temperature over 10 °C do not hold up for long periods. About five to ten days in June, July and August have an average temperature above 15 °C. This determines the short vegetation period in the high elevation areas which varies from three to six months; it lasts about three months at elevation over 2,000 m. The average annual temperature

7950-519: The middle height zone it ranges from 2.5 to 3.2 m/s. Winds are usually strongest in winter and lightest in autumn. The annual duration of sunshine in the Alpine zone is 1930 hours with maximum in August and minimum in December–January; it raises to more than 2150 hours at 1,000 m. Rila is an important hydrological unit in Bulgaria with very high hydropower potential, representing about 1/4 of

8056-629: The most important of them being fueled by the Belmeken Dam in East Rila ;— Chaira Pumped Storage Hydro Power Plant (864 MW), Belmeken Pumped Storage Hydro Power Plant (375 MW), Sestrimo Hydro Power Plant (240 MW) and Momina Klisura Hydroelectric Power Station (120 MW). Chaira is the largest pumped storage HPP in South-eastern Europe. They form the Belmeken–Sestrimo–Chaira Hydropower Cascade ,

8162-463: The mountain was 2,100–2,200 m. The glaciers reached elevations as low as 1,200 m. Above this boundary, the glaciers radically altered the existing relief, forming deep cirques, pyramidal peaks , steep cliffs, long U-shaped valleys , moraine fields and other glacial forms. On the slopes of some valleys such as those of the rivers Beli Iskar, Maritsa and Rilska there are hanging glacier valleys  — tributary valleys located higher than

8268-562: The mountain; the rest lies within Rila Monastery Nature Park . In addition, there are five nature reserves : Parangalitsa , Central Rila Reserve , Rila Monastery Forest , Ibar and Skakavitsa . The most recognisable landmark of the mountain range is the Rila Monastery , Bulgaria's largest and most important monastery, founded in the 10th century by Saint John of Rila . Due to its outstanding cultural and spiritual value it

8374-528: The north, the Predel Saddle that separates it from Pirin to the south, and Simitli and Blagoevgrad valleys to the west. It covers about 30% of the area of the mountain range. With an average elevation of 1,307 m, it has the lowest elevation in Rila. The highest summit is Angelov Peak (2,643 m). The Blagoevgradska Bistritsa River divides it in two distinct ridges to the north and to the south. Apart from its northernmost part, Southwest Rila does not have

8480-629: The northern slopes and after 20–30 December on the southern. Its average monthly thickness reaches 20 to 30 cm in February at low elevations. In the Alpine zone above 2,000 m the snow cover is thickest in March, reaching 70 to 80 cm. In the highest ridges the maximum thickness reaches 200 to 240 cm. The snow cover remains for an average of 70–80 days at elevations of 1,200–1,300 m and 180 to 200 days at elevations above 2,000 m. Avalanches are frequent, often caused by temperature changes by

8586-509: The northern slopes and occur especially often in the Samokov Valley, Borovets and Musala, where it is observed in 250 days annually. The annual precipitation varies with elevation and slope orientation. The annual precipitation is 653 mm at Samokov (1,029 m), 932 mm at Borovets (1,350 m) and 1200 mm at Musala (2,925 m); about 80% of it being snow at the later. The rainfall occurs mostly in summer and spring on

8692-493: The northern slopes, with maximum in June and minimum in February; the rainfall increases in winter and decreases in summer on the southern slopes and yet the monthly maximum and minimum are the same; there are 130–160 days with rainfall/snowfall. Air humidity in the highlands of Rila ranges between 80 and 85%. The coldest winter months are also the driest. Humidity differs on the northern and southern slopes of Rila. The snow cover above 1,000 m begins to form on 10–15 December on

8798-511: The obvious impracticality of placebo-controlled studies (in which a patient does not know if they are receiving the therapy). As a result, the therapeutic effectiveness of hot spring therapy remains uncertain. Hot springs in volcanic areas are often at or near the boiling point . People have been seriously scalded and even killed by accidentally or intentionally entering these springs. Some hot springs microbiota are infectious to humans: The customs and practices observed differ depending on

8904-658: The place of origin of life on Earth. The evolutionary implications of the hypothesis imply a direct evolutionary pathway to land plants. Where continuous exposure to sunlight leads to the development of photosynthetic properties and later colonize on land and life at hydrothermal vents is suggested to be a later adaptation. Recent experimental studies at hot springs support this hypothesis. They show that fatty acids self-assemble into membranous structures and encapsulate synthesized biomolecules during exposure to UV light and multiple wet-dry cycles at slightly alkaline or acidic hot springs, which would not happen at saltwater conditions as

9010-537: The presence of microbial communities that produce clumps of oxidized iron from iron in the hydrothermal fluids feeding the spring. Some hot springs produce fluids that are intermediate in chemistry between these extremes. For example, mixed acid-sulfate-chloride hot springs are intermediate between acid sulfate and alkaline chloride springs and may form by mixing of acid sulfate and alkaline chloride fluids. They deposit geyserite, but in smaller quantities than alkaline chloride springs. Hot springs range in flow rate from

9116-568: The provincial capital (now Sofia ), in the sway of the Patriarchate of Constantinople , but the see faded (due to the Huns ?). No historical resident Bishop of Germania is recorded. The diocese was nominally restored in 1933 as Latin Titular bishopric of Germania in Dacia (Latin) / Germania di Dacia (Curiate Italian) / Germanien(sis) in Dacia (Latin adjective). It is vacant since decades, having had only

9222-599: The scientific basis for therapeutic bathing in hot springs is uncertain. Hot bath therapy for lead poisoning was common and reportedly highly successful in the 18th and 19th centuries, and may have been due to diuresis (increased production of urine) from sitting in hot water, which increased excretion of lead; better food and isolation from lead sources; and increased intake of calcium and iron. Significant improvement in patients with rheumatoid arthritis and ankylosing spondylitis have been reported in studies of spa therapy, but these studies have methodological problems, such as

9328-441: The south-eastern foothills (from west to east) — Razlog (12,036), Belitsa (2,964) and Yakoruda (5,288). There are a number of villages, including among others Govedartsi , Belchin , Madzhare , Kostenets , Pastra , Stob , Barakovo , Dobarsko , etc. Some of the settlements on the Rila include a small Aromanian minority. The mountain range is served by several roads running along its foothills. No roads traverse

9434-544: The summit of Musala. Rila Monastery is the most important architectural monument in the mountain range. It is situated at an elevation of 1,147 m and was declared a UNESCO's world heritage site in 1983. The Monastery is considered to be a cultural and spiritual centre of Bulgaria. With its architecture and frescos Rila Monastery represents a masterpiece of the creative genius of the Bulgarian people and has exerted considerable influence on architecture and aesthetics within

9540-556: The surrounding mountain ranges – Klisura Saddle (1,025 m) with Verila to the north-west, Borovets Saddle (1,305 m) with Sredna Gora to the north, Yundola (1,375 m) and Avramovo Saddles (1,295 m) with the Rhodope Mountains to the south-east and Predel Saddle (1,140 m) with Pirin to the south. Within these limits Rila spans an area of 2,629 km and has an average elevation of 1,487 m. The high elevation zone over 1,600 m forms about 50% of

9646-479: The tiniest "seeps" to veritable rivers of hot water. Sometimes there is enough pressure that the water shoots upward in a geyser , or fountain . There are many claims in the literature about the flow rates of hot springs. There are many more high flow non-thermal springs than geothermal springs. Springs with high flow rates include: Hot springs often host communities of microorganisms adapted to life in hot, mineral-laden water. These include thermophiles , which are

9752-465: The total potential of the country. The water reserves that form within the mountain range are the most important source of clean potable water for the surrounding settlements, the national capital Sofia and part of the population of Northern Greece and European Turkey. The regime of the rivers of Rila is directly related to the elevation and about half of the water reserves in the mountain are at an elevation above 2,050 m. The main drainage divide in

9858-489: The total territory. There are over 140 main peaks above 2,000 m. With an elevation of 2,925 m at Musala, Rila is the highest mountain range in Bulgaria and the Balkan Peninsula , and the sixth highest in Europe after the Caucasus , the Alps , Sierra Nevada , the Pyrenees and Mount Etna . Musala is the fourth most isolated peak in continental Europe after Mont Blanc , Mount Elbrus and Galdhøpiggen raising at

9964-572: The town of Kostenets, where it joins the first class I-8 road , part of European route E80 . The second class II-19 road which branches off I-1 at Simitli , goes east crossing the Predel Saddle into the Razlog Valley and at the homonymous town links with the second class II-84 road which runs in north-eastern direction along the Avramovo Saddle and links with the I-8 road/E80 near Pazardzhik . Rila

10070-602: The traditional Bulgarian National Revival style with several edifices and a park. Its 170 kW hydroelectric generator installed in 1912 is still working unaltered. Two other hunting lodges were constructed for the monarchs — Sitnyakovo and Saragyol . There are 17 mountains refuges with a total of 1938 beds. There are 198 km primary and 363 km secondary hiking trails in Rila National Park, including E4 European long distance path that traverses it from west to south and E8 European long distance path that traverses it from north-west to south. Rila National Park

10176-599: The two main ridges in Central Rila, Skakavitsa and Rilets. The highest summit is Cherna Polyana (2,716 m); other important peaks are Skalata, Small and Big Skakavets, Rilets; there are 28 peaks over 2,100 m. This subdivision is renowned mainly for the glacial lakes Ribni , Dzhendemski, Manastirski, as well as the largest glacial lake in the Balkan Peninsula ;— Smradlivo Lake . Northwest Rila, known also as Malyovitsa Rila, occupies about 24% of Rila and

10282-512: The valleys of Beli Iskar and Maritsa; the Ibar Ridge runs in west–east direction from the summit of Marishki Chal to the Avramovo Saddle. It covers 37% of the mountain's territory and contains the highest summit in the range — Musala (2,925 m), as well as 12 of the 18 summits over 2,700 m — Irechek (2,852 m), Deno (2,790 m), Mancho (2,771 m) and others; there are 46 peaks over 2,100 m. East Rila contains

10388-490: The vent. Acid sulfate hot springs show a somewhat different succession of microorganisms, dominated by acid-tolerant algae (such as members of Cyanidiophyceae ), fungi , and diatoms. Iron-rich hot springs contain communities of photosynthetic organisms that oxidize reduced ( ferrous ) iron to oxidized ( ferric ) iron. Hot springs are a dependable source of water that provides a rich chemical environment. This includes reduced chemical species that microorganisms can oxidize as

10494-472: The village of Kostenets with a total discharge of 12 L/sec and temperature of 46–73 °C. Rila has well developed cultural tourism and contains five of the 100 Tourist Sites of Bulgaria  — the Church of Theodore Tyro and Theodore Stratelates in the village of Dobarsko , the Rila Monastery and the Stob Earth Pyramids , the Seven Rila Lakes, the museum of history and the convent in the town of Samokov, and

10600-443: The water in the cistern, raising its temperature above the normal boiling point. The water will not immediately boil, because the weight of the water column above the cistern pressurizes the cistern and suppresses boiling. However, as the superheated water expands, some of the water will emerge at the surface, reducing pressure in the cistern. This allows some of the water in the cistern to flash into steam, which forces more water out of

10706-479: The water is boiled as fast as it can accumulate and only reaches the surface in the form of steam , the result is a fumarole . If the water is mixed with mud and clay , the result is a mud pot . An example of a non-volcanic warm spring is Warm Springs, Georgia (frequented for its therapeutic effects by paraplegic U.S. President Franklin D. Roosevelt , who built the Little White House there). Here

10812-425: The width — between 375 m and 10 m, the area — between 1 m and 212 decares, the depth — between 0.5 m and 37.5 m. Most of them are between 2 m and 10 m deep and four reach depth of over 20 m. The water is transparent as deep as 15 m. Most of the lakes are covered with ice during most of the year — from October to June. The ice thickness reaches 3 m in

10918-543: The zone between 1,300 m and 1,600 m is dominated by European beech ( Fagus sylvatica ), at places mixed with European silver fir ( Abies alba ). The endemic Rila oak ( Quercus protoroburoides ) inhabits only the Rilska River valley. The forests of coniferous zone between 1,600 m and 2,100 m consist of primarily of Norway spruce ( Picea abies ), Macedonian pine ( Pinus peuce ) и Scots pine ( Pinus sylvestris ). The sub-Alpine zone up to 2,500 m

11024-411: Was declared a UNESCO World Heritage Site in 1983. Rila is also a popular destination for hiking, winter sports and spa tourism, hosting the nation's oldest ski resort Borovets , as well as numerous hiking trails. Some of the most important hydro power stations in Bulgaria are situated in the eastern part of the mountain range, including the Belmeken–Sestrimo–Chaira Hydropower Cascade (1,599 MW),

11130-558: Was the birthplace of the great Byzantine general Belisarius and was mentioned in the 6th century as Γερμανία, Γερμανός, Γέρμεννε. In an 11th-century charter of Byzantine Emperor Basil II (Porphyrogenitus/ the Young), it was listed as Γερμάνεια ( Germaneia ). Germania in Dacia was important enough in the late Roman province of Dacia Mediterranea to become a suffragan bishopric of the Metropolitan Archdiocese of Sardica in

11236-572: Was visited by about 100,000 tourists annually for the period 2000–2014 reaching a peak of 268,000 in 2012, while with a little more than 1 million visitors Rila Monastery Nature Park is the second most visited one in the country, after Vitosha . In 2000 on the south-western slopes was established the Dancing Bears Park Belitsa that shelters all dancing bears from Bulgaria following the ban of that practice, as well as individuals from Albania and Serbia. The abundant mineral springs along

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