A landform is a natural or anthropogenic land feature on the solid surface of the Earth or other planetary body . Landforms together make up a given terrain , and their arrangement in the landscape is known as topography . Landforms include hills , mountains , canyons , and valleys , as well as shoreline features such as bays , peninsulas , and seas , including submerged features such as mid-ocean ridges , volcanoes , and the great ocean basins .
60-445: A hill is a landform that extends above the surrounding terrain. It often has a distinct summit , and is usually applied to peaks which are above elevation compared to the relative landmass, though not as prominent as mountains . Hills fall under the category of slope landforms . The distinction between a hill and a mountain is unclear and largely subjective, but a hill is universally considered to be not as tall, or as steep as
120-486: A castro is a fortified pre- Roman Iron Age village, usually located on a hill or some naturally easy defendable place. The larger hillforts are also called citanias , cividades or cidás (English: cities ). They were located on hilltops, which allowed tactical control over the surrounding countryside and provided natural defences. They usually had access to a spring or small creek to provide water; some even had large reservoirs to use during sieges . Typically,
180-453: A castro had one to five stone and earth walls, which complemented the natural defences of the hill. The buildings inside, most of them circular in shape, some rectangular, were about 3.5–15 m (11–49 ft) long; they were made out of stone with thatch roofs resting on a wood column in the centre of the building. In the major oppida there were regular streets, suggesting some form of central organization. Castros vary in area from less than
240-447: A common list of castles, fortresses, forts, an hillforts. The Latvian word for hillfort is pilskalns (plural: pilskalni ), from pils (castle) and kalns (hill). Hillforts in Latvia offered not only military and administrative functions but they were also cultural and economic centres of some regions. Latvian hillforts generally were a part of a complex consisting of
300-889: A hectare to some 50 hectare ones, and most were abandoned after the Roman conquest of the territory. Many castros were already established during the Atlantic Bronze Age period, pre-dating the Hallstatt culture . Many of the megaliths from the Bronze Age such as menhirs and dolmens , which are frequently located near the castros, also pre-date the Celts in Portugal, Asturias and Galicia as well as in Atlantic France, Britain and Ireland. These megaliths were probably reused in syncretic rituals by
360-436: A hill). The rounded peaks of hills results from the diffusive movement of soil and regolith covering the hill, a process known as downhill creep . Various names may be used to describe types of hills, based on appearance and method of formation. Many such names originated in one geographical region to describe a type of hill formation particular to that region, though the names are often adopted by geologists and used in
420-498: A military reaction to social tensions caused by an increasing population and consequent pressure on agriculture. The dominant view, since the 1960s, has been that the increasing use of iron led to social changes in Britain. Deposits of iron ore were located in different places to the tin and copper ore necessary to make bronze and, as a result, trading patterns shifted and the old elites lost their economic and social status. Power passed into
480-641: A mountain is usually defined in the UK and Ireland as any summit at least 2,000 feet or 610 meters high, while the UK government's Countryside and Rights of Way Act 2000 defined mountainous areas (for the purposes of open access legislation) as areas above 600 meters (1,969 feet). Some definitions include a topographical prominence requirement, typically 100 feet (30.5 m) or 500 feet (152.4 m). In practice, mountains in Scotland are frequently referred to as "hills" no matter what their height, as reflected in names such as
540-465: A mountain. Geographers historically regarded mountains as hills greater than 1,000 feet (304.8 meters) above sea level . In contrast, hillwalkers have tended to regard mountains as peaks 2,000 feet (610 m) above sea level. The Oxford English Dictionary also suggests a limit of 2,000 feet (610 m) and Whittow states "Some authorities regard eminences above 600 m (1,969 ft) as mountains, those below being referred to as hills." Today,
600-526: A much smaller force entrenched on the hill top. Battles for the possession of high ground have often resulted in heavy casualties to both sides, such as the 1969 Battle of Hamburger Hill during the Vietnam War , the Battle of Stalingrad and Battle of Peleliu during World War II , and the 1969 Kargil War between India and Pakistan. The Great Wall of China is an enduring example of hilltop fortification. It
660-449: A range of purposes and were variously tribal centres, defended places, foci of ritual activity, and places of production. Hillforts were frequently occupied by conquering armies, but on other occasions the forts were destroyed, the local people forcibly evicted, and the forts left derelict. For example, Solsbury Hill was sacked and deserted during the Belgic invasions of southern Britain in
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#1732837125075720-917: A refuge against attacking enemies. Ijang were first described by the English freebooter Captain William Dampier when he visited the island of Ivuhos in 1687. During the Spanish colonial era , ijang were abandoned during the Reducciones as the Ivatan population were moved into centralized towns in the lowlands. Among the Māori people , villages called pā were often built on raised ground, like volcanic hills, headlands, and small islands (including artificial islands ). The slopes were terraced into defensive ramparts that were usually further protected by palisades . Traditional pā took
780-473: A stone wall or earthen rampart or both. These would have been important tribal centres where the chief or king of the area would live with his extended family and support themselves by farming and renting cattle to their underlings. There are around 40 known hillforts in Ireland. About 12 are multivallate as distinguished by multiple ramparts, or a large counterscarp (outer bank). The imposing example at Mooghaun
840-454: A wider geographical context. These include: Many settlements were originally built on hills, either to avoid floods (particularly if they were near a large body of water), for defense (since they offer a good view of the surrounding land and require would-be attackers to fight uphill), or to avoid densely forested areas. For example, Ancient Rome was built on seven hills , helping to protect it from invaders. Some settlements, particularly in
900-905: Is linnamägi (plural linnamäed ), meaning hillfort or hillburgh . There are several hundred hillforts or presumed ancient hillfort sites all over Estonia. Some of them, like Toompea in Tallinn or Toomemägi in Tartu, are governance centres used since ancient times up until today. Some others, like Varbola are historical sites nowadays. Most likely the Estonian hillforts were in pre-Christian times administrative, economic and military centres of Estonian tribes . Although some of them were probably used only during times of crisis and stood empty in peacetime (for example Soontagana in Koonga parish, Pärnu county ). List of Estonian fortresses [ et ] contains
960-446: Is a type of fortified refuge or defended settlement located to exploit a rise in elevation for defensive advantage. They are typical of the late European Bronze Age and Iron Age . Some were used in the post- Roman period. The fortification usually follows the contours of a hill and consists of one or more lines of earthworks or stone ramparts , with stockades or defensive walls , and external ditches. If enemies were approaching,
1020-402: Is defended by multiple stone walls. One must be careful to not confuse a hill-fort with a ' ringfort '—a medieval settlement—a common archaeological feature across the whole island of Ireland, of which over 40,000 examples are known; one source claims there may be 10,000 undiscovered ringforts. In Galicia , Asturias , Cantabria , Basque Country , province of Ávila and Northern Portugal
1080-547: Is popular in hilly areas such as the English Peak District and the Scottish Highlands . Many hills are categorized according to relative height or other criteria and feature on lists named after mountaineers, such as Munros (Scotland) and Wainwrights (England). Specific activities such as " peak bagging " (or "Munro bagging") involve climbing hills on these lists with the aim of eventually climbing every hill on
1140-478: Is the largest amongst forts reoccupied following the end of Roman rule , to defend against pirate raids, and the Anglo-Saxon invasions. The cemetery outside Poundbury Hill contains east-facing Christian burials of the 4th century CE. In Wales, the hillfort at Dinas Powys was a late Iron Age hillfort reoccupied from the 5th-6th centuries CE; similarly at Castell Dinas Brân a hillfort of c. 600 BCE
1200-425: Is the third or vertical dimension of land surface . Topography is the study of terrain, although the word is often used as a synonym for relief itself. When relief is described underwater , the term bathymetry is used. In cartography , many different techniques are used to describe relief, including contour lines and triangulated irregular networks . Elementary landforms (segments, facets, relief units) are
1260-606: The Bronze Age in the 1st millennium BC. The earliest examples in present-day Lithuania are found in the east of the country. Most of these forts were built or expanded between the fifth and fifteenth centuries, when they were used in the Dukes' Wars, and against the invasion of Teutonic Knights from the west. Most forts were located on the banks of a river, or a confluence where two rivers met. These fortifications were typically wooden, although some had additional stone or brick walls. The hill
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#17328371250751320-585: The Cuillin Hills and the Torridon Hills . In Wales, the distinction is more a term of land use and appearance and has nothing to do with height. For a while, the US defined a mountain as being 1,000 feet (304.8 m) or more tall. Any similar landform lower than this height was considered a hill. The United States Geological Survey , however, has concluded that these terms do not in fact have technical definitions in
1380-674: The Hill Forts of Rajasthan . In the Philippines , the Ivatan people of the Batanes Islands built ijang —fortified villages on top of natural hills and raised landforms near the coastlines. These were terraced into defensive ramparts with limited access points. Artifacts recovered from an ijang on the town of Savidug in Sabtang has been dated to around 1200 CE. These high rocky formations served as
1440-874: The Neman River (against the Teutonic Order) and another along the border with Livonia . Two other lines started to form, but did not fully develop. One was to protect Vilnius , the capital, and the other line in Samogitia , was a major target for both orders. This territory separated the two Orders and prevented joint action between them and Pagan Lithuania. As of 2017 , according to the Atlas of Lithuanian Hillforts , there were 921 objects in Lithuania identified as piliakalniai . Most piliakalniai are located near rivers and are endangered by erosion: many have partly collapsed as
1500-504: The Universe . Examples are mountains, hills, polar caps, and valleys, which are found on all of the terrestrial planets . The scientific study of landforms is known as geomorphology . In onomastic terminology, toponyms (geographical proper names) of individual landform objects (mountains, hills, valleys, etc.) are called oronyms . Landforms may be extracted from a digital elevation model (DEM) using some automated techniques where
1560-577: The 1775 Battle of Bunker Hill (which was actually fought on Breed's Hill ) in the American War of Independence ; and Cemetery Hill and Culp's Hill in the 1863 Battle of Gettysburg , the turning point of the American Civil War . The Battle of San Juan Hill in the 1898 Spanish–American War won the Americans control of Santiago de Cuba but only after suffering from heavy casualties inflicted by
1620-588: The 1st century BC. Abandoned forts were sometimes reoccupied and refortified under renewed threat of foreign invasion, such as the Dukes' Wars in Lithuania , and the successive invasions of Britain by Romans , Saxons and Vikings . Celtic hillforts developed in the Late Bronze and Early Iron Age, roughly the start of the first millennium BC , and were used in many Celtic areas of central and western Europe until
1680-479: The 5th–8th centuries AD, when many new hillforts appeared, in most cases, along the main trades routes—rivers. During the 10th–11th centuries, some of the hillforts became military fortresses with strong fortifications (like hillforts in Tērvete , Talsi , Mežotne ). Some of them are considered important political centres of the local peoples, who in this period were subjects of serious social political changes. That period
1740-533: The Celtic Druids . The Celtiberian people occupied an inland region in central northern Spain, straddling the upper valleys of the Ebro , Douro and Tajo . They built hillforts, fortified hilltop towns and oppida , including Numantia . During the period of Late Antiquity or Migration Period a large number of hilltop settlements were established both on the Roman imperial territory and on Germanic soil. However,
1800-704: The Finnish hillforts that while most of them are located these days within some distance from the sea, but earlier many of the forts were located by the sea, due to post-glacial rebound . Finland has around 100 hillforts verified by excavations, and about 200 more suspected sites. The largest hillfort in Finland is the Rapola Castle , other notable are the Old Castle of Lieto and the Sulkava hillfort. The Estonian word for hillfort
1860-551: The Iron Age were small, with perhaps no more than 50 inhabitants. Hillforts were the exception, and were the home of up to 1,000 people. With the emergence of oppida in the Late Iron Age, settlements could reach as large as 10,000 inhabitants. As the population increased so did the complexity of prehistoric societies. Around 1100 BC hillforts emerged and in the following centuries spread through Europe. They served
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1920-440: The Iron Age were sometimes used for corralling animals in later periods. For example, see Coney's Castle , Dolebury Warren and Pilsdon Pen . However, it is difficult to prove that people definitely did not dwell there, as lack of evidence is not proof of absence. Bronze Age and Iron Age hillforts are widely found in Ireland. They are large circular structures between 1 and 40 acres (most commonly 5–10 acres) in size, enclosed by
1980-443: The Iron Age which may have had several functions. They are usually located on the crests of hills and mountains making use of precipices and marshes which worked as natural defences. The crests' more accessible parts were defended with walls of stone and outer walls in the slopes beneath are common. Round and closed, so-called ring forts are common even on flat ground. The walls often have remaining parts of stone, which were probably
2040-515: The Middle East, are located on artificial hills consisting of debris (particularly mudbricks ) that has accumulated over many generations. Such a location is known as a " tell ". In Northern Europe , many ancient monuments are sited in heaps. Some of these are defensive structures (such as the hillforts of the Iron Age ), but others appear to have hardly any significance. In Britain, many churches at
2100-552: The Roman conquest. They are most common during later periods: The Hallstatt culture and La Tène culture originated in what is now southern Germany, Switzerland, Austria, Slovakia and the Czech Republic. The predominant form of rampart construction was pfostenschlitzmauer , or Kelheim-style . During the Hallstatt ;C period, hillforts became the dominant settlement type in the west of Hungary. Julius Caesar described
2160-685: The US. The Great Soviet Encyclopedia defined "hill" as an upland with a relative height of up to 200 m (660 ft). A hillock is a small hill. Other words include knoll and (in Scotland, Northern Ireland and northern England) its variant, knowe. Artificial hills may be referred to by a variety of technical names, including mound and tumulus . Hills may form through geomorphic phenomena : faulting , erosion of larger landforms such as mountains and movement and deposition of sediment by glaciers (notably moraines and drumlins or by erosion exposing solid rock which then weathers down into
2220-417: The city's fog and civil engineering projects today famous as tourist attractions such as the cable cars and Lombard Street . Hills provide important advantages to an army that controls their heights, giving them an elevated view and firing position and forcing an opposing army to charge uphill to attack a fort or other position. They may also conceal forces behind them, allowing a force to lie in wait on
2280-509: The civilians would spot them from a distance. Prehistoric Europe saw a growing population. It has been estimated that in about 5000 BC during the Neolithic between 2 million and 5 million lived in Europe; in the Late Iron Age it had an estimated population of around 15 to 30 million. Outside Greece and Italy , which were more densely populated, the vast majority of settlements in
2340-507: The crest of a hill, using that crest for cover, and firing on unsuspecting attackers as they broach the hilltop. As a result, conventional military strategies often demand possession of high ground. Because of their strategic and tactical values, hills have been the site of many notable battles, such as the Battle of Alesia in 52 BC and the first recorded military conflict in Scotland, the Battle of Mons Graupius in AD 83. Modern era conflicts include
2400-684: The data has been gathered by modern satellites and stereoscopic aerial surveillance cameras. Until recently, compiling the data found in such data sets required time consuming and expensive techniques involving many man-hours. The most detailed DEMs available are measured directly using LIDAR techniques. Igstar, cxvellie (2017), Howard, Jeffrey (ed.), "Anthropogenic Landforms and Soil Parent Materials", Anthropogenic Soils, Progress in Soil Science, Cham: Springer International Publishing, pp. 25–51, doi:10.1007/978-3-319-54331-4_3, ISBN 978-3-319-54331-4, retrieved 2022-08-12 Hillfort A hillfort
2460-701: The element sten / stein were usually hillforts. In Sweden, there are 1,100 known hillforts with a strong concentration on the northern west coast and in eastern Svealand . In Södermanland there are 300, in Uppland 150, Östergötland 130, and 90 to 100 in each of Bohuslän and Gotland . Norway has about 400 hillforts. Denmark has 26 hillforts. The Finnish word for hillfort is linnavuori (plural linnavuoret ), meaning fort hill or castle hill , or alternatively muinaislinna meaning ancient fort , as opposed to bare linna which refers to medieval or later fortifications. One special feature about
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2520-633: The excavator to implicate the Cadbury population in a revolt in the 70's AD (roughly contemporary with that of Boudicca in the East of England), although this has been questioned by subsequent researchers. However, the presence of barracks on the hilltop in the decades following the conquest suggest an ongoing struggle to suppress local dissent. Maiden Castle in Dorset is the largest hillfort in England. Where Roman influence
2580-400: The flooded river has washed out the base of the hill. Now around 80 percent of piliakalniai are covered by forests and are hardly accessible to visitors. In Russia , Belarus and Poland Iron Age and Early Medieval hillforts are called gords . They were the residence of local rulers, and provided for refuge in times of war. Similar structures can be found elsewhere in the world, such as
2640-639: The four major types of landforms. Minor landforms include buttes , canyons, valleys, and basins. Tectonic plate movement under the Earth can create landforms by pushing up mountains and hills. Oceans and continents exemplify the highest-order landforms. Landform elements are parts of a high-order landforms that can be further identified and systematically given a cohesive definition such as hill-tops, shoulders, saddles , foreslopes and backslopes. Some generic landform elements including: pits, peaks, channels, ridges, passes, pools and plains. Terrain (or relief )
2700-511: The hands of a new group of people. Archaeologist Barry Cunliffe believes that population increase still played a role and has stated "[the forts] provided defensive possibilities for the community at those times when the stress [of an increasing population] burst out into open warfare. But I wouldn't see them as having been built because there was a state of war. They would be functional as defensive strongholds when there were tensions and undoubtedly some of them were attacked and destroyed, but this
2760-507: The large late Iron Age hillforts he encountered during his campaigns in Gaul as oppida . By this time the larger ones had become more like cities than fortresses and many were assimilated as Roman towns. The reason for the emergence of hillforts in Britain, and their purpose, has been a subject of debate. It has been argued that they could have been military sites constructed in response to invasion from continental Europe, sites built by invaders, or
2820-1076: The list. Cooper's Hill Cheese-Rolling and Wake is an annual event in the West Country of England which involves rolling a wheel of cheese down a hill. Contestants stand at the top and chase the wheel of cheese to the bottom. The winner, the one who catches the cheese, gets to keep the wheel of cheese as a prize. Cross country running courses may include hills which can add diversity and challenge to those courses. Landform Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, structure stratification , rock exposure, and soil type. Gross physical features or landforms include intuitive elements such as berms , mounds , hills , ridges , cliffs , valleys , rivers , peninsulas , volcanoes , and numerous other structural and size-scaled (e.g. ponds vs. lakes , hills vs. mountains ) elements including various kinds of inland and oceanic waterbodies and sub-surface features. Mountains, hills, plateaux , and plains are
2880-582: The main fortress, the settlement around it, one or more burial fields and nearby ritual sites. The first hillforts in Latvia, such as Daugmale hillfort, appeared during the Bronze Age . Some were continuously inhabited until the late Iron Age . During the Roman Iron Age, some of the Latvian hillforts (like Ķivutkalns ) were abandoned or became sparsely populated. A new period in hillfort development started during
2940-492: The role of vegetation in the development of dune systems and salt marshes , and the work of corals and algae in the formation of coral reefs . Landforms do not include several man-made features, such as canals , ports and many harbors ; and geographic features, such as deserts , forests , and grasslands . Many of the terms are not restricted to refer to features of the planet Earth , and can be used to describe surface features of other planets and similar objects in
3000-644: The smallest homogeneous divisions of the land surface, at the given scale/resolution. These are areas with relatively homogeneous morphometric properties, bounded by lines of discontinuity. A plateau or a hill can be observed at various scales, ranging from a few hundred meters to hundreds of kilometers. Hence, the spatial distribution of landforms is often scale-dependent, as is the case for soils and geological strata. A number of factors, ranging from plate tectonics to erosion and deposition (also due to human activity), can generate and affect landforms. Biological factors can also influence landforms—for example, note
3060-489: The support of pales. They often have well delineated gateways, the gates of which were probably of wood. Hillforts with strong walls are often located beside old trade routes and have an offensive character, whereas others are reclusive and were weakly fortified, probably only for hiding during raids. Many forts, located centrally in densely populated areas, were permanently settled strongholds and can show traces of settlements both inside and outside. Older place names containing
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#17328371250753120-732: The term embraces a wide range of very different settlements in high locations. At least a few of the Germanic settlements were protected by fortifications. Unlike the Romans, however, the Germanii did not use mortar at that time for their construction. Among the best known hill settlements in Germany are the Runder Berg near Bad Urach and the Gelbe Bürg near Dittenheim. In Sweden, hillforts are fortifications from
3180-493: The tops of hills are thought to have been built on the sites of earlier pagan holy places. The Washington National Cathedral in Washington, D.C. has followed this tradition and was built on the highest hill in that city. Some cities' hills are culturally significant in their foundation, defense, and history. In addition to Rome, hills have played a prominent role in the history of San Francisco , with its hills being central to
3240-969: Was a new linear earthwork connected to the existing hillfort at Maes Knoll , which defined the Celtic-Saxon border in south-west England during the period 577–652 CE. Some hillforts were re-occupied by the Anglo-Saxons during the period of Viking raids. King Alfred established a network of coastal hillforts and lookout posts in Wessex , linked by a Herepath , or military road, which enabled his armies to cover Viking movements at sea. For example, see Daw's Castle and Battle of Cynwit . It has been suggested on reasonable evidence that many so-called hillforts were just used to pen in cattle, horses, or other domesticated animals. The large sprawling examples at Bindon Hill and Bathampton Down are more than 50 acres (20 ha ). Even those that were defensive settlements in
3300-414: Was built on hilltops to help defend against invaders from the north, such as Mongols . Hillwalking is a British English term for a form of hiking which involves the ascent of hills. The activity is usually distinguished from mountaineering as it does not involve ropes or technically difficult rock climbing , although the terms mountain and hill are often used interchangeably in Britain. Hillwalking
3360-557: Was known for unrest and military activities, as well as power struggles between local aristocracy. Most of the Latvian hillforts were destroyed or abandoned during the Livonian Crusade in the 13th century, but some were still used in the 14th century. In total, there are about 470 hillforts in Latvia. The Lithuanian word for hillfort is piliakalnis (plural piliakalniai ), from pilis (=castle) and kalnas (=mountain, hill). Lithuania has hillforts dating from
3420-497: Was less strong, such as uninvaded Ireland and unsubdued northern Scotland, hillforts were still built and used for several more centuries. There are over 2,000 Iron Age hillforts known in Britain of which nearly 600 are in Wales. Danebury in Hampshire , is the most thoroughly investigated Iron Age hillfort in Britain, as well as the most extensively published. Cadbury Castle, Somerset
3480-640: Was not the only, or even the most significant, factor in their construction". Hillforts in Britain are known from the Bronze Age , but the great period of hillfort construction was during the Celtic Iron Age, between 700 BC and the Roman conquest of Britain in 43 AD. The Romans occupied some forts, such as the military garrison at Hod Hill , and the temple at Brean Down , but others were destroyed and abandoned. Partially articulated remains of between 28 and 40 men, women and children at Cadbury Castle were thought by
3540-497: Was reused in the Middle Ages, with a stone castle built there in the 13th century CE. Some Iron Age hillforts were also incorporated into medieval frontier earthworks. For example Offa's Dyke , a linear earthwork generally dated to the 9th century CE, makes use of the west and south-west ramparts of Llanymynech hillfort. Similarly the hillfort at Old Oswestry was incorporated into the early medieval Wat's Dyke . The Wansdyke
3600-553: Was usually sculpted for defensive purposes, with the top flattened and the natural slopes made steeper for defence. During the early years of Grand Duchy of Lithuania piliakalniai played a major role in conflicts with the Livonian Order and the Teutonic Knights . During this period the number of piliakalniai in use decreased, but those that remained had stronger fortifications. Two main defence lines developed: one along
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