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NASA photo of the endorheic Tarim Basin
NASA photo of the endorheic Tarim Basin

An endorheic basin (from Greek endo ‘inside’ + rhein ‘to flow’; also terminal or closed basin) is a closed drainage basin that retains water and allows no outflow to other bodies of water such as rivers or oceans. The Tarim Basin ( is a large Endorheic basin occupying an area of more than 400000 km² Greek (el ελληνική γλώσσα or simply el ελληνικά — "Hellenic" is an Indo-European language, spoken today by 15-22 million people mainly A drainage basin is an extent of Land where Water from Rain or Snow melt drains downhill into a body of water such as a River, Normally the water accruing in drainage basins flows out through surface rivers or by underground diffusion through permeable rock to the oceans. "Riverine" redirects here For the use of that term in Maritime geography, see there Permeability in the Earth sciences (commonly symbolized as κ, or k) is a measure of the ability of a material (typically a rock or unconsolidated However, in an endorheic basin, rain (or other precipitation) that falls within it does not flow out but may only leave the drainage system by evaporation and seepage. In Meteorology, precipitation (also known as one class of hydrometeors, which are atmospheric water phenomena is any product of the condensation of atmospheric Evaporation is the process by which Molecules in a Liquid state (e Soil mechanics is a discipline that applies principles of Engineering mechanics, e The bottom of such a basin is typically occupied by a salt lake or salt pan. The salt lake or saline lake is a landlocked body of Water which has a concentration of Salts (mostly Sodium chloride) and other minerals significantly Natural salt pans are flat expanses of Ground covered with Salt and other Minerals usually shining white under the Sun. Endorheic basins are also called internal drainage systems.

Endorheic basin showing waterflow input
Endorheic basin showing waterflow input

Endorheic regions, in contrast to exorheic regions which flow to the ocean in geologically defined patterns, are closed hydroloic systems. Their surface waters drain to inland terminal locations where the water evaporates or seeps into the ground, having no access to discharge into the sea. [1] Endorheic water bodies include some of the largest lakes in the world, such as the Aral Sea and the Caspian Sea, the world’s largest saline body of water cut off from the ocean. The Aral Sea ( Kazakh: Арал Теңізі Aral Tengizi, Orol dengizi Russian: Аральскοе мοре Tajik / Persian: Daryocha-i The Caspian Sea is the largest enclosed body of water on Earth by area variously classed as the world's largest lake or a full-fledged Sea. [2]

Contents

Endorheic lakes

Endorheic lakes are bodies of water that do not flow into the sea. Most of the water falling on earth masses finds its way to the oceans through a network of rivers, lakes and wetlands or through evaporation. However, there is a class of water bodies that are located in closed or endorheic watersheds where the topography prevents their drainage to the oceans. These endorheic watersheds (containing water in rivers or lakes that form a balance of surface inflows, evaporation and seepage) are often called terminal lakes or sink lakes. [3]

Endorheic lakes are usually in the interior of a body mass, far from an ocean. Their watersheds often confined by natural geologic land formations such as a mountain range, cutting off water access to the ocean. The inland water flow into dry watersheds where the water evaporates, leaving a high concentration of minerals and other inflow erosion products. Over time this input of erosion products can cause the endorheic lake to become relatively saline. Since the main outflow pathways of these lakes are chiefly through evaporation and seepage, endorheic lakes are usually more sensitive to environmental pollutants inputs than water bodies that have access to oceans. [2]

Occurrence

Endorheic regions can occur in any climate but are most commonly found in hot desert locations. A desert is a Landscape or region that receives very little precipitation. In areas where rainfall is higher, riparian erosion will generally carve drainage channels (particularly in times of flood), breaking the enclosed endorheic hydrological system’s geographical barrier and opening it to the surrounding terrain. "Riparian" redirects here For the legal doctrine see " Riparian water rights. Hydrology (from Greek Yδωρ hudōr, "water" and λόγος logos, "study" is the study of the movement distribution and quality of The Black Sea was likely such a lake, having once been an independent hydrological system before the Mediterranean Sea broke through the terrain separating the two. The Black Sea is an inland Sea bounded by southeastern Europe, the Caucasus and the Anatolian peninsula ( Turkey

Endorheic regions tend to be far inland with their boundaries defined by mountains or other geological features that sever their access to oceans. Since the inflowing water can evacuate only through seepage or evaporation, dried minerals or other products collect in the basin, eventually making the water saline and also making the basin vulnerable to pollution. [2] Continents vary in their concentration of endorheic regions due to conditions of geography and climate. Australia has the highest percentage of endorheic regions at 18 percent while North America has the least at 5 percent. [4] Approximately 18 percent of the earth’s land drains to endorheic lakes or seas, the largest of these land areas being the interior of Asia.

In deserts, water inflow is low and loss to solar evaporation high, drastically reducing the formation of complete drainage systems. Closed water flow areas often lead to the concentration of salts and other minerals in the basin. Minerals leached from the surrounding rocks are deposited in the basin, and left behind when the water evaporates. Thus endorheic basins often contain extensive salt pans (also called salt flats, salt lakes, alkali flats or playas). Natural salt pans are flat expanses of Ground covered with Salt and other Minerals usually shining white under the Sun. The salt lake or saline lake is a landlocked body of Water which has a concentration of Salts (mostly Sodium chloride) and other minerals significantly In Chemistry, an alkali (from Arabic: Al-Qaly القلي القالي) is a basic, ionic salt of an Alkali metal These areas tend to be large, flat hardened surfaces and are sometimes used for aviation runways or land speed record attempts. Aviation refers to activities involving man-made flying devices ( Aircraft) including the people organizations and regulatory bodies involved with them A runway ( RWY) is a strip of land on an Airport, on which Aircraft can take off and land. The land speed record is the fastest speed achieved by any wheeled vehicle on land as opposed to one on water or in the air or on rails.

Both permanent and seasonal endorheic lakes can form in endorheic basins. Some endorheic basins are essentially stable, climate change having reduced precipitation to the degree that a lake no longer forms. Even most permanent endorheic lakes change size and shape dramatically over time, often becoming much smaller or breaking into several smaller parts during the dry season. As humans have expanded into previously uninhabitable desert areas, the river systems that feed many endorheic lakes have been altered by the construction of dams and aqueducts. As a result many endorheic lakes in developed or developing countries have contracted dramatically, resulting in increased salinity, higher concentrations of pollutants, and the disruption of ecosystems.

Notable endorheic basins and lakes

Major endorheic basins of the world. Basins are shown in dark gray; major endorheic lakes are shown in black.
Major endorheic basins of the world. Basins are shown in dark gray; major endorheic lakes are shown in black.

Antarctica

Endorheic lakes in Antarctica are located in the McMurdo Dry Valleys, Victoria Land, Antarctica, the largest ice-free area in Antarctica. "Dry valleys" redirects here For other uses see Dry valley The McMurdo Dry Valleys are a row of Valleys in Victoria Land is a region of Antarctica bounded on the east by the Ross Sea and on the west by Wilkes Land.

Asia

Caspian Sea, a giant inland basin
Caspian Sea, a giant inland basin

Much of western and Central Asia is a single, giant inland basin. The Caspian Sea is the largest enclosed body of water on Earth by area variously classed as the world's largest lake or a full-fledged Sea. Central Asia is a region of Asia from the Caspian Sea in the west to central China in the east and from southern Russia in the north to northern Pakistan in the south It contains a number of lakes, including:

Australia

Australia, being very dry and having exceedingly low runoff ratios due to its ancient soils, has a great prominence of variable, endorheic drainages. For a topic outline on this subject see List of basic Australia topics. The most important are:

A false-colour satellite photo of Australia’s Lake EyreImage credit: NASA’s Earth Observatory
A false-colour satellite photo of Australia’s Lake Eyre
Image credit: NASA’s Earth Observatory

Africa

North America

Great Salt Lake, Satellite photo (2003) after five years of drought
Great Salt Lake, Satellite photo (2003) after five years of drought

Europe

All these lakes are drained, however, either through manmade canals or via karstic phenomena. The Great Basin is a large arid region of the western United States. Nevada ( is a state located in the western region of the United States of America. The State of Utah (ˈjuːtɔː or) is a western state of the United States. The Black Rock Desert is a Dry lake bed and the surrounding Endorheic basin in northwestern Nevada in the United States. Nevada ( is a state located in the western region of the United States of America. Thrust2 is a British designed and built jet propelled car, which held the world Land speed record from 4 October 1983 to 15 October 1997 Thrust SSC ( '''S'''uper'''S'''onic C ar is a British designed and built jet -propelled car developed by Richard Noble, Glynne Burning Man is an annual event held in Death Valley is the lowest driest and hottest Valley in the United States. Area 51 is a nickname for a military base located in the southern portion of Nevada in the western United States Area 51 is a nickname for a military base located in the southern portion of Nevada in the western United States Great Salt Lake, located in the northern part of the US state of Utah, is the largest salt lake in the western hemisphere the fourth-largest terminal The Western Hemisphere, also Western hemisphere or western hemisphere, is a geographical term for the half of the Earth that lies West The Salton Sea is an inland Saline lake, occupying the lowest elevations of the Salton Sink, part of the larger Colorado Desert in Southern California ( is a US state on the West Coast of the United States, along the Pacific Ocean. Year 1905 ( MCMV) was a Common year starting on Sunday (link will display full calendar of the Gregorian calendar (or a Common year starting Sevier Lake (sɛˈviːr is an intermittent and Endorheic lake which lies in the lowest part of the Sevier Desert, Millard County Utah. Pyramid Lake is an Endorheic salt lake, approximately 188 Square miles (487  km ² in area in the Great Basin in the northwestern Mono Lake is an Alkaline and hypersaline lake in California, United States that is a critical nesting habitat for several bird species and is California ( is a US state on the West Coast of the United States, along the Pacific Ocean. Edwards Air Force Base is a United States Air Force base located on the border of Kern County and Los Angeles County California in the Antelope Edwards Air Force Base is a United States Air Force base located on the border of Kern County and Los Angeles County California in the Antelope California ( is a US state on the West Coast of the United States, along the Pacific Ocean. Tulare Lake is an extinct fresh-water Lake that was formerly the largest in the Western United States. The San Joaquin Valley (ˌsæn wɑːˈkiːn refers to the area of the Central Valley of California that lies south of the Sacramento-San Joaquin Delta The Kern River is a river in the US state of California, approximately long New Mexico ( is a state located in the southwestern region of the United States of America. The Tularosa Basin is a Graben basin in the basin and range area east of the Rio Grande in southern New Mexico, mostly in Otero County A rift valley is a linear-shaped lowland between highlands or mountain ranges created by the action of a geologic Rift or fault. Zuni Salt Lake, also Zuñi Salt Lake or Fence Lake ( Navajo: Áshįįh) is a rare high desert lake and a classic Maar. A maar is a broad low- Relief Volcanic crater that is caused by a Phreatomagmatic eruption, an Explosion caused by Groundwater Bolsón de Mapimí is an Endorheic river basin located in the center-north of the Mexican Plateau. The Guzmán Basin is an Endorheic basin of northern Mexico and the southwestern United States. Lake Atitlán ( Lago de Atitlán) is a large Endorheic Lake in the Guatemalan Highlands Lake Neusiedl (Neusiedlersee Fertő tó is the second largest Steppe lake in Central Europe, straddling the Austrian Hungarian border Lake Neusiedl (Neusiedlersee Fertő tó is the second largest Steppe lake in Central Europe, straddling the Austrian Hungarian border Austria (Österreich ( officially the Republic of Austria (Republik Österreich Hungary (Magyarország 'mɔɟɔrorsaːg) officially in English the Republic of Hungary ( Magyar Köztársaság, literally Magyar (Hungarian Republic Lake Trasimeno or Trasimene (in Italian: Lago Trasimeno) is the largest lake in the Italian peninsula south of the Po with a surface Italy (Italia officially the Italian Republic, (Repubblica Italiana is located on the Italian Peninsula in Southern Europe, and on the two largest Lake Velence is the third largest lake in Hungary. It is a popular holiday destination among Hungarians Hungary (Magyarország 'mɔɟɔrorsaːg) officially in English the Republic of Hungary ( Magyar Köztársaság, literally Magyar (Hungarian Republic Prespa is the name of two freshwater Lakes in Southeast Europe, shared by Greece, Albania, and the Republic of Macedonia. This article is about the country in southern Europe For a topic outline on this subject see List of basic Albania topics. Greece (Ελλάδα transliterated: Elláda, historically, Ellás,) officially the Hellenic Republic (Ελληνική Δημοκρατία The Republic of Macedonia (Република Canals are artificial channels for water There are two types of canals water conveyance canals which are used for the conveyance and delivery of water and Waterways Karst topography is a landscape shaped by the dissolution of a layer or layers of soluble Bedrock, usually Carbonate rock such as Limestone Minor additional endorheic lakes exist throughout the Mediterranean countries Spain (e. Spain () or the Kingdom of Spain (Reino de España is a country located mostly in southwestern Europe on the Iberian Peninsula. g. Laguna de Gallocanta), Italy, Cyprus (Larnaca and Akrotiri salt lakes) and Greece. Gallocanta is a municipality located in the province of Zaragoza, Aragon, Spain. Italy (Italia officially the Italian Republic, (Repubblica Italiana is located on the Italian Peninsula in Southern Europe, and on the two largest Greece (Ελλάδα transliterated: Elláda, historically, Ellás,) officially the Hellenic Republic (Ελληνική Δημοκρατία

South America

MODIS image from November 4, 2001 showing Lake Titicaca, the Salar de Uyuni, and the Salar de Coipasa. These are all parts of the Altiplano
MODIS image from November 4, 2001 showing Lake Titicaca, the Salar de Uyuni, and the Salar de Coipasa. Lake Titicaca is a lake located on the border of Bolivia and Peru. Salar de Uyuni (or Salar de Tunupa) is the world's largest Salt flat at 10582 km² (4085 square miles These are all parts of the Altiplano

Ancient

Some of the Earth’s ancient endorheic systems include:

See also

References

  1. ^ Drainage systems. Lake Bonneville was a prehistoric Pluvial lake that covered much of North America 's Great Basin region The following is a list of Endorheic basins — watersheds which do not drain to the sea Encyclopedia Britannica. Retrieved on 2008-02-11. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 660 BC - Traditional founding date of Japan by Emperor Jimmu.
  2. ^ a b c Endorheic Lakes: Waterbodies That Don't Flow to the Sea. United Nations Environment Programme. Retrieved on 2008-02-11. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 660 BC - Traditional founding date of Japan by Emperor Jimmu.
  3. ^ What is a watershed and why should I care?. university of delaware. Retrieved on 2008-02-11. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 660 BC - Traditional founding date of Japan by Emperor Jimmu.
  4. ^ Saline Lake Ecosystems of the World. Springer. Retrieved on 2007-07-31. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 30 BC - Battle of Alexandria: Mark Antony achieves a minor victory over Octavian 's forces but most of his army subsequently

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