geography Geography (from Ancient Greek ; combining 'Earth' and 'write', literally 'Earth writing') is the study of the lands, features, inhabitants, and phenomena of Earth. Geography is an all-encompassing discipline that seeks an understanding o ...

, a plain, commonly known as flatland, is a flat expanse of land that generally does not change much in

elevation The elevation of a geographic location (geography), ''location'' is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational equipotenti ...

, and is primarily treeless. Plains occur as

lowland Upland and lowland are conditional descriptions of a plain based on elevation above sea level. In studies of the ecology of freshwater rivers, habitats are classified as upland or lowland. Definitions Upland and lowland are portions of a ...

s along

valley A valley is an elongated low area often running between hills or mountains and typically containing a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over ...

s or at the base of

mountain A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher t ...

s, as

coastal plain A coastal plain (also coastal plains, coastal lowland, coastal lowlands) is an area of flat, low-lying land adjacent to a sea coast. A fall line commonly marks the border between a coastal plain and an upland area. Formation Coastal plains can f ...

s, and as

plateau In geology and physical geography, a plateau (; ; : plateaus or plateaux), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. ...

s or

uplands Upland or Uplands may refer to: Geography *Hill, an area of higher land, generally *Highland, an area of higher land divided into low and high points *Upland and lowland, conditional descriptions of a plain based on elevation above sea level *I ...

. Plains are one of the major

landform A landform is a land feature on the solid surface of the Earth or other planetary body. They may be natural or may be anthropogenic (caused or influenced by human activity). Landforms together make up a given terrain, and their arrangement ...

s on earth, being present on all continents and covering more than one-third of the world's land area. Plains in many areas are important for

agriculture Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created ...

. There are various types of plains and

biome A biome () is a distinct geographical region with specific climate, vegetation, and animal life. It consists of a biological community that has formed in response to its physical environment and regional climate. In 1935, Tansley added the ...

s on them. Horton Plains 2021

Description

A plain or flatland is a flat expanse of land with a layer of grass that generally does not change much in

, and is primarily treeless. Plains occur as

s along

s or at the base of

s, as

s, and as

s or

. Plains are one of the major

s on earth, where they are present on all continents, and cover more than one-third of the world's land area. In a valley, a plain is enclosed on two sides, but in other cases a plain may be delineated by a complete or partial ring of hills, by mountains, or by

cliff In geography and geology, a cliff or rock face is an area of Rock (geology), rock which has a general angle defined by the vertical, or nearly vertical. Cliffs are formed by the processes of weathering and erosion, with the effect of gravity. ...

s. Where a geological region contains more than one plain, they may be connected by a

pass Pass, PASS, The Pass or Passed may refer to: Places *Pass, County Meath, a townland in Ireland *Pass, Poland, a village in Poland *El Paso, Texas, a city which translates to "The Pass" * Pass, an alternate term for a number of straits: see Li ...

(sometimes termed a gap). Coastal plains mostly rise from

sea level Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more among Earth's coastal Body of water, bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical ...

until they run into elevated features such as mountains or plateaus. Plains can be formed from flowing

lava Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a Natural satellite, moon onto its surface. Lava may be erupted at a volcano or through a Fissure vent, fractu ...

; from deposition of sediment by water, ice, or wind; or formed by

erosion Erosion is the action of surface processes (such as Surface runoff, water flow or wind) that removes soil, Rock (geology), rock, or dissolved material from one location on the Earth's crust#Crust, Earth's crust and then sediment transport, tran ...

by the agents from hills or mountains.

Biome A biome () is a distinct geographical region with specific climate, vegetation, and animal life. It consists of a biological community that has formed in response to its physical environment and regional climate. In 1935, Tansley added the ...

s on plains include

grassland A grassland is an area where the vegetation is dominance (ecology), dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes such as clover, and other Herbaceo ...

(

temperate In geography, the temperate climates of Earth occur in the middle latitudes (approximately 23.5° to 66.5° N/S of the Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ran ...

subtropical The subtropical zones or subtropics are geographical zone, geographical and Köppen climate classification, climate zones immediately to the Northern Hemisphere, north and Southern Hemisphere, south of the tropics. Geographically part of the Ge ...

steppe In physical geography, a steppe () is an ecoregion characterized by grassland plains without closed forests except near rivers and lakes. Steppe biomes may include: * the montane grasslands and shrublands biome * the tropical and subtropica ...

(

semi-arid A semi-arid climate, semi-desert climate, or steppe climate is a aridity, dry climate sub-type. It is located on regions that receive precipitation below Evapotranspiration#Potential evapotranspiration, potential evapotranspiration, but not as l ...

savannah A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) biome and ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach th ...

(

tropical The tropics are the regions of Earth surrounding the equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's ax ...

) or

tundra In physical geography, a tundra () is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. There are three regions and associated types of tundra: #Arctic, Arctic, Alpine tundra, Alpine, and #Antarctic ...

(

polar Polar may refer to: Geography * Geographical pole, either of the two points on Earth where its axis of rotation intersects its surface ** Polar climate, the climate common in polar regions ** Polar regions of Earth, locations within the polar circ ...

). In a few instances,

desert A desert is a landscape where little precipitation occurs and, consequently, living conditions create unique biomes and ecosystems. The lack of vegetation exposes the unprotected surface of the ground to denudation. About one-third of the la ...

s and

rainforest Rainforests are forests characterized by a closed and continuous tree Canopy (biology), canopy, moisture-dependent vegetation, the presence of epiphytes and lianas and the absence of wildfire. Rainforests can be generally classified as tropi ...

s may also be considered plains. Plains in many areas are important for

because where the soils were deposited as

sediment Sediment is a solid material that is transported to a new location where it is deposited. It occurs naturally and, through the processes of weathering and erosion, is broken down and subsequently sediment transport, transported by the action of ...

s they may be deep and

fertile Fertility in colloquial terms refers the ability to have offspring. In demographic contexts, fertility refers to the actual production of offspring, rather than the physical capability to reproduce, which is termed fecundity. The fertility rate is ...

, and the flatness facilitates mechanization of crop production; or because they support grasslands which provide good grazing for

livestock Livestock are the Domestication, domesticated animals that are raised in an Agriculture, agricultural setting to provide labour and produce diversified products for consumption such as meat, Egg as food, eggs, milk, fur, leather, and wool. The t ...

Types of plain

Depositional plains

The types of depositional plains include: *

Abyssal plain An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between . Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth's surface. They ...

s, flat or very gently sloping areas of the deep ocean basin. *

Planitia In geography, a plain, commonly known as flatland, is a flat expanse of land that generally does not change much in elevation, and is primarily treeless. Plains occur as lowlands along valleys or at the base of mountains, as coastal plains, and ...

, the

Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...

word for plain, is used in the naming of plains on extraterrestrial objects (planets and moons), such as

Hellas Planitia Hellas Planitia is a plain located within the huge, roughly circular impact basin Hellas located in the southern hemisphere of the planet Mars. Hellas is the fourth- or fifth-largest known impact crater in the Solar System. The basin floor ...

Mars Mars is the fourth planet from the Sun. It is also known as the "Red Planet", because of its orange-red appearance. Mars is a desert-like rocky planet with a tenuous carbon dioxide () atmosphere. At the average surface level the atmosph ...

Sedna Planitia Sedna Planitia is a large lowland area of Venus Venus is the second planet from the Sun. It is often called Earth's "twin" or "sister" planet for having almost the same size and mass, and the closest orbit to Earth's. While both are r ...

Venus Venus is the second planet from the Sun. It is often called Earth's "twin" or "sister" planet for having almost the same size and mass, and the closest orbit to Earth's. While both are rocky planets, Venus has an atmosphere much thicker ...

. * Alluvial plains, which are formed by rivers and which may be one of these overlapping types: **

Alluvial plain An alluvial plain is a plain (an essentially flat landform) created by the deposition of sediment over a long period by one or more rivers coming from highland regions, from which alluvial soil forms. A ''floodplain'' is part of the process, bei ...

s, formed over a long period of time by a

river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...

depositing sediment on their flood plains or beds, which become

alluvial Alluvium (, ) is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. Alluvium is also sometimes called alluvial deposit. Alluvium is ...

soil. The difference between a flood plain and an alluvial plain is: a flood plain represents areas experiencing flooding fairly regularly in the present or recently, whereas an alluvial plain includes areas where a flood plain is now and used to be, or areas which only experience flooding a few times a century. **

Flood plain A floodplain or flood plain or bottomlands is an area of land adjacent to a river. Floodplains stretch from the banks of a river channel to the base of the enclosing valley, and experience flooding during periods of high Discharge (hydrolog ...

, adjacent to a lake, river, stream, or wetland that experiences occasional or periodic

flooding A flood is an overflow of water ( or rarely other fluids) that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide. Floods are of significant concern in agriculture, civi ...

. **

Scroll plain A scroll plain occurs where a river meanders across an area with a very low gradient, usually with a fairly continuous discharge. In addition to meanders, scroll plains are also characterised by many oxbow lakes. See also *Strath A strath is a ...

, a plain through which a river

meander A meander is one of a series of regular sinuous curves in the Channel (geography), channel of a river or other watercourse. It is produced as a watercourse erosion, erodes the sediments of an outer, concave bank (cut bank, cut bank or river cl ...

s with a very low gradient. * Glacial plains, formed by the movement of glaciers under the force of gravity: **

Outwash plain An outwash plain, also called a sandur (plural: ''sandurs''), sandr or sandar, is a plain formed of glaciofluvial deposits due to meltwater outwash at the glacier terminus, terminus of a glacier. As it flows, the glacier grinds the underlying r ...

(also known as sandur; plural sandar), a glacial out-wash plain formed of sediments deposited by melt-water at the terminus of a glacier. Sandar consist mainly of stratified (layered and sorted) gravel and sand. **

Till plain Till plains are an extensive flat plain of glacial till that forms when a sheet of ice becomes detached from the main body of a glacier and melts in place, depositing the sediments it carried. Ground moraines are formed with melts out of the glac ...

s, plain of

glacial till image:Geschiebemergel.JPG, Closeup of glacial till. Note that the larger grains (pebbles and gravel) in the till are completely surrounded by the matrix of finer material (silt and sand), and this characteristic, known as ''matrix support'', is d ...

that form when a sheet of

ice Ice is water that is frozen into a solid state, typically forming at or below temperatures of 0 ° C, 32 ° F, or 273.15 K. It occurs naturally on Earth, on other planets, in Oort cloud objects, and as interstellar ice. As a naturally oc ...

becomes detached from the main body of a

glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...

and melts in place depositing the

s it carries. Till plains are composed of unsorted material (till) of all sizes. *

Lacustrine plain A lacustrine plain or lake plain is a plain formed due to the past existence of a lake and its accompanying sedimentation, sediment accumulation. Lacustrine plains can be formed through one of three major mechanisms: glacial drainage, differentia ...

s, plains that originally formed in a lacustrine environment, that is, as the bed of a

lake A lake is often a 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 ...

. *

Lava plain A lava field, sometimes called a lava bed, is a large, mostly flat area of lava flows. Such features are generally composed of highly fluid basalt lava, and can extend for tens or hundreds of kilometers across the underlying terrain. Morph ...

s, formed by sheets of flowing

Erosional plains

Erosional plains have been leveled by various agents of denudation such as running water, rivers, wind and glacier which wear out the rugged surface and smoothens them. Plain resulting from the action of these agents of denudation are called ''

peneplain In geomorphology and geology, a peneplain is a low-relief plain formed by protracted erosion. This is the definition in the broadest of terms, albeit with frequency the usage of peneplain is meant to imply the representation of a near-final (or ...

s'' (almost plain) while plains formed from wind action are called ''

pediplain In geology and geomorphology a pediplain (from the Latin ''pes'', genitive case ''pedis'', meaning "foot") is an extensive plain formed by the coalescence of pediment (geology), pediments. The processes through which pediplains forms is known a ...

s''.

Structural plains

Structural plains are relatively undisturbed horizontal surfaces of the Earth. They are structurally depressed areas of the world that make up some of the most extensive natural lowlands on the Earth's surface. Curry County Eastern New Mexico 2010

Notable examples

Esta%C3%A7%C3%A3o_Ecol%C3%B3gica_do_Taim

View of the South Småland peneplain at Store Mosse National Park in Sweden. Nsomersetlevels

America

Caribbean and South America

Altiplano The Altiplano (Spanish language, Spanish for "high plain"), Collao (Quechuan languages, Quechua and Aymara language, Aymara: Qullaw, meaning "place of the Qulla people, Qulla") or Andean Plateau, in west-central South America, is the most extens ...

(Bolivia, Chile) *

Altiplano Cundiboyacense The Altiplano Cundiboyacense () is a high plateau located in the Eastern Cordillera of the Colombian Andes covering parts of the departments of Cundinamarca and Boyacá. (Do not confuse with The Altiplano or the Altiplano Nariñense, both fur ...

(Colombia) *

Caroni Plain On the island of Trinidad in the Republic of Trinidad and Tobago, the Caroni Plain is a lowland area between the Northern Range and the Central Range. The lowland areas to the south of the Central Range are the Naparima Plain on the west and the ...

(

Trinidad and Tobago Trinidad and Tobago, officially the Republic of Trinidad and Tobago, is the southernmost island country in the Caribbean, comprising the main islands of Trinidad and Tobago, along with several List of islands of Trinidad and Tobago, smaller i ...

) *

Chilean Central Valley The Central Valley (), Intermediate Depression, or Longitudinal Valley is the depression between the Chilean Coastal Range and the Andes Mountains. The Chilean Central Valley extends from the border with Peru to Puerto Montt in southern Chile, wi ...

** ** Los Llanos *

Gran Chaco The Gran Chaco or simply Chaco is a sparsely populated, hot and semiarid lowland tropical dry broadleaf forest natural region of the Río de la Plata basin, divided among eastern Bolivia, western Paraguay, northern Argentina, and a portion o ...

(Argentina, Bolivia, Paraguay) *

Llanos The Llanos ( Spanish ''Los Llanos'', "The Plains"; ) is a vast tropical grassland plain situated to the east of the Andes in Colombia and Venezuela, in northwestern South America. It is an ecoregion of the tropical and subtropical grasslands, ...

(Colombia and Venezuela) * Pampas (Argentina, Uruguay, Brazil) * Coastal plains of Chile

North America

* Atlantic coastal plain (United States) * Carrizo Plain (California, United States) * Great Plains (Canada and United States) * Guatemala South Coast (Guatemala) * Gulf Coastal Plain (Mexico and United States) * Interior Plains (Canada and United States) * Lake Superior Lowland (Wisconsin, United States) * Laramie Plains (Wyoming) * Mississippi Alluvial Plain (Mississippi) * Oxnard Plain (Ventura County, California) * Snake River Plain (Idaho)

Asia

Eastern Asia

* Chianan Plain (Taiwan) * Depsang Plains (China and India) * Honam Plain (South Korea) * Kantō Plain (Japan) * Kedu Plain (Indonesia) * Kewu Plain (Indonesia) * Mallig Plains (Philippines) * Nōbi Plain (Japan) * North China Plain (China) * Osaka Plain (Japan) * Pingtung Plain (Taiwan) * Sarobetsu plain (Japan) * Sendai Plain (Japan) * Yilan Plain (Taiwan)

North Asia

* West Siberian Plain (Russia)

South Asia

* Bhuikhel (Nepal) * Depsang Plains (India and China) * Dooars (India and Bhutan) * Eastern coastal plains (India) * Indo-Gangetic Plains (Bangladesh, India, Nepal and Pakistan) * More plains (India) * North Bengal plains (Bangladesh and India) * Punjab Plains (Pakistan and India) * Terai (India and Nepal) * Utkal Plains (India) * Western coastal plains (India)

Western Asia

* Al-Ghab Plain (Syria) * Aleppo plateau (Syria) * Ararat Plain (Armenia and Turkey) * Israeli coastal plain (Israel) * Khuzestan Plain (Iran) * Mugan plain (Azerbaijan and Iran) * Nineveh Plains (Iraqi Kurdistan) * Shiraki Plain (Georgia (country), Georgia)

Europe

Central Europe

* Limagne (France) * North German Plain * Ochsenfeld (France) * Pannonian Basin (Central Europe) * Parndorf Plain (Austria) * Westphalian Lowland (Germany)

Eastern Europe

* Bărăgan Plain (Romania) * Danubian Plain (Bulgaria), Danubian Plain (Bulgaria) * Dnieper Lowland (Ukraine) * East European Plain * European Plain * Great Hungarian Plain * Kosovo field (region), Kosovo field (Kosovo) * Little Hungarian Plain (Austria, Hungary, and Slovakia) * Pannonian Steppe (Hungary) * Polesian Lowland (Ukraine and Belarus) * Upper Thracian Plain (Bulgaria) * Wallachian Plain (Romania)

Northern Europe

* Cheshire Plain (England) * Hardangervidda (Norway) * Kaffiøyra (Svalbard, Norway) * Muddus plains (Sweden) * North European Plain * North Northumberland Coastal Plain (Northern England) * North Somerset Levels (North Somerset, England) * Salisbury Plain (England) * Solway Plain (Cumbria, England) * Somerset Levels (Somerset, England) * South Coast Plain (Hampshire and Sussex, England) * South Småland peneplain (Sweden) * Stora Alvaret (Öland, Sweden) * Strandflat (Norway) * Sub-Cambrian peneplain (Nordic countries) ** Central Swedish lowland ** Ostrobothnian Plain (Finland) * The Fylde (Lancashire, England)

Southern Europe

* Agro Nocerino Sarnese (Italy) * Campidano (Italy) * Lelantine Plain (Greece) * Mesaoria (Cyprus) * Messara Plain (Greece) * Nurra (Sardinia, Italy) * Po Valley (Italy) * Rieti Valley (Central Italy) * Tavoliere delle Puglie (Southern Italy)

Oceania

Australia

* Bogong High Plains (Victorian Alps, Australia) * Cumberland Plain (Sydney, Australia) * Esperance Plains (Western Australia) * Molonglo Plain (Australian Capital Territory) * Mulga Lands (eastern Australia) * Nullarbor Plain (Southern Australia) * Ord Victoria Plain (Northern Australia) * Swan Coastal Plain (Perth, Australia)

New Zealand

* Awarua Plains (Southland, New Zealand, Southland) * Canterbury Plains (Canterbury Region, Canterbury) * Hauraki Plains (Waikato) * Maniototo (Otago) * Taieri Plains, Taieri (Otago)

References

External links

* {{Authority control Plains, Slope landforms Agricultural land Grasslands Meadows Geography terminology