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A lake is an area filled with water, localized in a basin, surrounded by
land Land is the solid surface of Earth that is not permanently submerged in water. Most but not all land is situated at elevations above sea level (variable over geologic time frames) and consists mainly of Earth's crust, crustal components such a ...

land
, and set apart from any
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

river
or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the
ocean The ocean (also the or the world ocean) is the body of that covers approximately 70.8% of the surface of and contains 97% of . Another definition is "any of the large bodies of water into which the great ocean is divided".water cycle The water cycle, also known as the hydrologic cycle or the hydrological cycle, describes the continuous movement of water Water is an Inorganic compound, inorganic, Transparency and translucency, transparent, tasteless, odorless, ...

water cycle
. Lakes are distinct from
lagoon A lagoon is a shallow body of water separated from a larger body of water by a narrow , such as s, s, s, or . Lagoons are commonly divided into ''coastal lagoons'' and '' lagoons''. They have also been identified as occurring on mixed-sand and ...

lagoon
s, which are generally coastal parts of the ocean. Lakes are typically larger and deeper than
pond A pond is an area filled with water, either natural or artificial Artificiality (the state of being artificial or man-made) is the state of being the product of intentional human manufacture, rather than occurring naturally through processes ...

pond
s, which also lie on land, though there are no official or scientific definitions. Lakes can be contrasted with
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

river
s or
stream A stream is a body of water with surface water flowing within the stream bed, bed and Bank (geography), banks of a Channel (geography), channel. The flow of a stream is controlled by three inputs – surface water, subsurface water and ground ...

stream
s, which usually flow in a channel on land. Most lakes are fed and drained by rivers and streams. Natural lakes are generally found in mountainous areas,
rift zone upright=1.2, East Rift Zone on Kīlauea, Hawaii A rift zone is a feature of some volcanoes, especially shield volcanoes, in which a set of linear cracks (or rifts) develops in a volcanic edifice, typically forming into two or three well-defined re ...
s, and areas with ongoing
glaciation A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age An ice age is a long period of reduction in the temperature of Earth Earth is the third planet from the Sun and the on ...

glaciation
. Other lakes are found in
endorheic basin An endorheic basin (; also spelled endoreic basin or endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but drainage converges instead into lakes ...
s or along the courses of mature rivers, where a river channel has widened into a basin. Some parts of the world have many lakes formed by the chaotic drainage patterns left over from the last
Ice Age An ice age is a long period of reduction in the temperature of Earth Earth is the third planet from the Sun and the only astronomical object known to harbour and support life. 29.2% of Earth's surface is land consisting of continents and ...

Ice Age
. All lakes are temporary over , as they will slowly fill in with sediments or spill out of the basin containing them. Many lakes are
artificial Artificiality (the state of being artificial or man-made) is the state of being the product of intentional human manufacture, rather than occurring naturally through processes not involving or requiring human activity. Connotations Artificiality of ...
and are constructed for industrial or agricultural use, for
hydro-electric power Hydroelectricity, or hydroelectric power, is electricity produced from hydropower Hydropower (from el, ὕδωρ, "water"), also known as water power, is the use of falling or fast-running water to produce electricity or to power machin ...
generation or domestic water supply, for aesthetic or recreational purposes, or for other activities.


Etymology, meaning, and usage of "lake"

The word ''lake'' comes from
Middle English Middle English (abbreviated to ME) was a form of the English language spoken after the Norman conquest of England, Norman conquest (1066) until the late 15th century. The English language underwent distinct variations and developments following ...
('lake, pond, waterway'), from
Old English Old English (, ), or Anglo-Saxon, is the earliest recorded form of the English language English is a West Germanic language of the Indo-European language family The Indo-European languages are a language family A language ...
('pond, pool, stream'), from
Proto-Germanic Proto-Germanic (abbreviated PGmc; also called Common Germanic) is the reconstructed Reconstruction may refer to: Politics, history, and sociology *Reconstruction (law), the transfer of a company's (or several companies') business to a new ...
('pond, ditch, slow moving stream'), from the
Proto-Indo-European Proto-Indo-European (PIE) is the theorized common ancestor of the Indo-European language family The Indo-European languages are a language family A language is a structured system of communication used by humans, including speech ( ...
root ('to leak, drain'). Cognates include
Dutch Dutch commonly refers to: * Something of, from, or related to the Netherlands * Dutch people () * Dutch language () *Dutch language , spoken in Belgium (also referred as ''flemish'') Dutch may also refer to:" Castle * Dutch Castle Places * ...
('lake, pond, ditch'),
Middle Low German Middle Low German or Middle Saxon (autonym: ''Sassisch'', i.e. "Saxon", Standard German, Standard High German: ', Dutch language, Modern Dutch: ') is a developmental stage of Low German. It developed from the Old Saxon language in the Middle ...
('water pooled in a riverbed, puddle') as in: :de:Wolfslake, :de:Butterlake,
German German(s) may refer to: Common uses * of or related to Germany * Germans, Germanic ethnic group, citizens of Germany or people of German ancestry * For citizens of Germany, see also German nationality law * German language The German la ...

German
('pool, puddle'), and
Icelandic Icelandic refers to anything of, from, or related to Iceland and may refer to: *Icelandic people *Icelandic language *Icelandic alphabet *Icelandic cuisine See also

* Icelander (disambiguation) * Icelandic Airlines, a predecessor of Icelandai ...
('slow flowing stream'). Also related are the English words ''leak'' and ''leach''. There is considerable uncertainty about defining the difference between lakes and
pond A pond is an area filled with water, either natural or artificial Artificiality (the state of being artificial or man-made) is the state of being the product of intentional human manufacture, rather than occurring naturally through processes ...

pond
s, and neither term has an internationally accepted definition across scientific disciplines or political boundaries. For example,
limnologist Limnology ( ; from Greek λίμνη, ''limne'', "lake" and λόγος, ''logos'', "knowledge") is the study of inland aquatic ecosystems An aquatic ecosystem is an ecosystem An ecosystem is a community (ecology), community of living organ ...
s have defined lakes as water bodies that are simply a larger version of a pond, which can have wave action on the shoreline or where wind-induced turbulence plays a major role in mixing the water column. None of these definitions completely excludes ponds and all are difficult to measure. For this reason, simple size-based definitions are increasingly used to separate ponds and lakes. Definitions for ''lake'' range in minimum sizes for a body of water from to . Pioneering animal ecologist
Charles EltonCharles Elton may refer to: *Charles Elton (Born, 1993) Professional Rugby Player for Otago Rugby * Charles Isaac Elton (1839–1900), English lawyer, politician, writer and antiquarian * Charles Sutherland Elton (1900–1991), English biologist * ...
regarded lakes as waterbodies of or more. The term ''lake'' is also used to describe a feature such as
Lake Eyre Lake Eyre ( ), Dual naming, officially known as Kati Thanda–Lake Eyre, is an endorheic lake in east-central Far North (South Australia), Far North South Australia, some north of Adelaide. The shallow lake is the depocentre of the vast endorh ...

Lake Eyre
, which is a dry basin most of the time but may become filled under seasonal conditions of heavy rainfall. In common usage, many lakes bear names ending with the word ''pond'', and a lesser number of names ending with ''lake'' are, in quasi-technical fact, ponds. One textbook illustrates this point with the following: "In Newfoundland, for example, almost every lake is called a pond, whereas in Wisconsin, almost every pond is called a lake." One
hydrology Hydrology (from Greek#REDIRECT Greek Greek may refer to: Greece Anything of, from, or related to Greece Greece ( el, Ελλάδα, , ), officially the Hellenic Republic, is a country located in Southeast Europe. Its population is approxi ...
book proposes to define the term "lake" as a body of water with the following five characteristics: # It partially or totally fills one or several basins connected by
strait A strait is a naturally formed, narrowing, typically navigable waterway that connects two larger bodies of water. The surface water generally flows at the same elevation on both sides and through the strait in either direction. Most commonly it ...

strait
s; # It has essentially the same water level in all parts (except for relatively short-lived variations caused by wind, varying ice cover, large inflows, etc.); # It does not have regular intrusion of
seawater Seawater, or salt water, is water Water is an Inorganic compound, inorganic, Transparency and translucency, transparent, tasteless, odorless, and Color of water, nearly colorless chemical substance, which is the main constituent of E ...

seawater
; # A considerable portion of the
sediment Sediment is a naturally occurring material that is broken down by processes of weathering Weathering is the deterioration of rocks A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is cate ...

sediment
suspended in the water is captured by the basins (for this to happen they need to have a sufficiently small inflow-to-volume ratio); # The area measured at the mean water level exceeds an arbitrarily chosen threshold (for instance, one
hectare The hectare (; SI symbol: ha) is a non-SI metric unit of area Area is the quantity Quantity is a property that can exist as a multitude or magnitude, which illustrate discontinuity and continuity. Quantities can be compared in terms o ...

hectare
). With the exception of criterion 3, the others have been accepted or elaborated upon by other hydrology publications.


Distribution

The majority of lakes on Earth are
freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water Water is an Inorganic compound, inorganic, Transparency and translucency, transparent, tasteless, odorless, and Color of water, nearly colorless chemical subs ...

freshwater
, and most lie in the
Northern Hemisphere The Northern Hemisphere is the half of Earth Earth is the third planet from the Sun and the only astronomical object known to harbour and support life. 29.2% of Earth's surface is land consisting of continents and islands. The remain ...

Northern Hemisphere
at higher
latitude In geography Geography (from Greek: , ''geographia'', literally "earth description") is a field of science devoted to the study of the lands, features, inhabitants, and phenomena of the Earth and planets. The first person to use the ...

latitude
s.
Canada Canada is a country in the northern part of North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean, Atlantic to the Pacific Ocean, Pacific and northward into the Arctic Oce ...

Canada
, with a deranged drainage system, has an estimated 31,752 lakes larger than in surface area. The total number of lakes in Canada is unknown but is estimated to be at least 2 million.
Finland Finland ( fi, Suomi ; sv, Finland ), officially the Republic of Finland (; ), is a Nordic country in Northern Europe. It shares land borders with Sweden to the west, Russia to the east, Norway to the north, and is defined by the Gulf of B ...

Finland
has 187,888 lakes of in area, or larger, of which 56,000 are large ( or larger). Most lakes have at least one natural outflow in the form of a
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

river
or
stream A stream is a body of water with surface water flowing within the stream bed, bed and Bank (geography), banks of a Channel (geography), channel. The flow of a stream is controlled by three inputs – surface water, subsurface water and ground ...

stream
, which maintain a lake's average level by allowing the drainage of excess water. Some lakes do not have a natural outflow and lose water solely by evaporation or underground seepage, or both. These are termed
endorheic An endorheic basin (; also spelled endoreic basin or endorreic basin) is a drainage basin A drainage basin is any area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of ...
lakes. Many lakes are artificial and are constructed for
hydro-electric Hydroelectricity, or hydroelectric power, is electricity produced from hydropower. In 2015, hydropower generated 16.6% of the world's total electricity and 70% of all renewable electricity,http://www.ren21.net/wp-content/uploads/2016/06/GSR ...
power generation, aesthetic purposes,
recreation Recreation is an activity of leisure Leisure has often been defined as a quality of experience or as free time. Free time is spent away from , , , , and , as well as necessary activities such as and ing. Leisure as an experience usuall ...

recreation
al purposes, industrial use,
agricultural Agriculture is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary Image:Family watching television 1958.jpg, Exercise trends, Increases in sedentary behaviors such as watching tele ...

agricultural
use, or domestic
water supply Water supply is the provision of water Water (chemical formula H2O) is an , transparent, tasteless, odorless, and , which is the main constituent of 's and the s of all known living organisms (in which it acts as a ). It is vital for ...
. The number of lakes on Earth is undetermined because most lakes and ponds are very small and do not appear on maps or
satellite imagery Satellite images (also Earth observation imagery, spaceborne photography, or simply satellite photo) are images of Earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. About 29% of Earth's su ...
. Despite this uncertainty, a large number of studies agree that small ponds are much more abundant than large lakes. For example, one widely cited study estimated that Earth has 304 million lakes and ponds, and that 91% of these are or less in area. Despite the overwhelming abundance of ponds, almost all of Earth's lake water is found in fewer than 100 large lakes; this is because lake volume
scales Scale or scales may refer to: Mathematics * Scale (descriptive set theory)In the mathematical discipline of descriptive set theory, a scale is a certain kind of object defined on a set (mathematics), set of point (mathematics), points in some Poli ...
superlinearly with lake area. Evidence of extraterrestrial lakes exists; "definitive evidence for the presence of lakes" was announced by NASA as returned by the
Cassini ProbeCassini may refer to: People * Cassini (surname) * Oleg Cassini (1913-2006), American fashion designer :Cassini family: * Giovanni Domenico Cassini (1625–1712), Italian mathematician, astronomer, engineer, and astrologer * Jacques Cassini (1677 ...
observing the moon
Titan Titan most often refers to: * Titan (moon), the largest moon of Saturn * Titans, a race of deities in Greek mythology Titan or Titans may also refer to: Arts and entertainment Fictional entities Fictional locations * Titan in fiction, fictional ...
, which orbits the planet
Saturn Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine and a half times that of Earth. It only has one-eighth the average density of Earth; how ...

Saturn
. The distribution and shape of lakes on Titan is very similar to those on Earth. Lakes were formerly present on the surface of Mars, but are now
dry lake bed A dry lake, also known as a playa, is either a basin or depression that formerly contained a standing surface water body, which disappeared when evaporation processes exceeded recharge. If the floor of a dry lake is covered by deposits of alkali ...
s.


Types

In 1957,
HutchinsonHutchinson may refer to: Places United States * Hutchinson, Kansas * South Hutchinson, Kansas * Hutchinson, Minnesota * Hutchinson, Pennsylvania * Hutchinson, West Virginia, in Logan County * Hutchinson, Marion County, West Virginia * Hutchinso ...
published a monograph titled ''A Treatise on Limnology'', which is regarded as a landmark discussion and classification of all major lake types, their origin, morphometric characteristics, and distribution. Hutchinson presented in his publication a comprehensive analysis of the origin of lakes and proposed what is a widely accepted classification of lakes according to their origin. This classification recognizes 11 major lake types that are divided into 76 subtypes. The 11 major lake types are: * tectonic lakes * volcanic lakes * glacial lakes * fluvial lakes * solution lakes * landslide lakes * aeolian lakes * shoreline lakes * organic lakes * anthropogenic lakes * meteorite (extraterrestrial impact) lakes


Tectonic lakes

Tectonic lakes are lakes formed by the deformation and resulting lateral and vertical movements of the Earth's crust. These movements include faulting, tilting, folding, and warping. Some of the largest lakes on Earth are
rift lake A rift lake is a lake A lake is an area filled with water, localized in a basin, surrounded by land, apart from any river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another ...
s occupying rift valleys, e.g. Central African Rift lakes and
Lake Baikal Lake Baikal (; russian: Oзеро Байкал, Ozero Baykal ; bua, Байгал далай, Baigal dalai; mn, Байгал нуур, Baigal nuur) is a rift lake A rift lake is a lake A lake is an area filled with water, localized in ...

Lake Baikal
. Other well-known tectonic lakes,
Caspian Sea The Caspian Sea (also known as Mazandaran Sea, Hyrcanian Ocean, or Khazar Sea), tk, Hazar deňzi, az, Xəzər Dənizi, russian: Каспийское море, script=Latn, fa, دریای مازندران، دریای خزر, script=Latn, tly, ...

Caspian Sea
, the Sea of Aral, and other lakes from the Pontocaspian occupy basins that have been separated from the sea by the tectonic uplift of the sea floor above the ocean level. Often, the tectonic action of crustal extension has created an alternating series of parallel
graben In geology Geology (from the Ancient Greek γῆ, ''gē'' ("earth") and -λoγία, ''-logia'', ("study of", "discourse")) is an Earth science concerned with the solid Earth, the rock (geology), rocks of which it is composed, and the proces ...

graben
s and horsts that form elongate basins alternating with mountain ranges. Not only does this promote the creation of lakes by the disruption of preexisting drainage networks, it also creates within arid regions
endorheic basin An endorheic basin (; also spelled endoreic basin or endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but drainage converges instead into lakes ...
s that contain
salt lakes A salt lake or saline lake is a landlocked body of water ( Lysefjord) in Norway Norway ( nb, ; nn, ; se, Norga; smj, Vuodna; sma, Nöörje), officially the Kingdom of Norway, is a Nordic countries, Nordic country in Northern ...
(also called saline lakes). They form where there is no natural outlet, a high evaporation rate and the drainage surface of the
water table The water table is the upper surface of the Phreatic zone, zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with water. It can also be simply explained as the depth below which the ground is ...

water table
has a higher-than-normal
salt Salt is a mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure fo ...

salt
content. Examples of these salt lakes include
Great Salt Lake The Great Salt Lake, located in the northern part of the U.S. state of Utah, is the largest salt water lake in the Western Hemisphere, and the eighth-largest terminal lake in the world. In an average year the lake covers an area of approximat ...

Great Salt Lake
and the
Dead Sea The Dead Sea ( he, יָם הַמֶּלַח lit. Sea of Salt; ar, البحر الميت , lit. ''the Dead Sea'',The first article ''al-'' is unnecessary and usually not used. or Buhayrat, Bahret or Birket Lut, ''lit.'' "Lake/Sea of Lot") is a s ...

Dead Sea
. Another type of tectonic lake caused by faulting is
sag pond 250px, Elizabeth Lake is one of numerous sag ponds along the San Andreas Fault. A sag pond is a body of fresh water collected in the lowest parts of a depression (geology), depression formed between two sides of an active geologic fault, strike-sl ...
s.


Volcanic lakes

Volcanic lakes are lakes that occupy either local depressions, e.g. craters and
maar A maar is a broad, low-relief Relief is a sculptural technique where the sculpted elements remain attached to a solid background of the same material. The term ''wikt:relief, relief'' is from the Latin verb ''relevo'', to raise. To create a ...
s, or larger basins, e.g. , created by
volcanism Volcanism (or volcanicity) is the phenomenon of eruption of molten rock (magma) onto the Earth#Surface, surface of the Earth or a solid-surface planet or moon, where lava, pyroclastics and volcanic gases erupt through a break in the surface called ...
.
Crater lake Crater Lake (Klamath language, Klamath: ''Giiwas'') is a Volcanic crater lake, crater lake in south-central Oregon in the western United States. It is the main feature of Crater Lake National Park and is famous for its deep blue color and water ...
s are formed in
volcanic crater A volcanic crater is an approximately circular depression in the ground caused by volcanic activity. It is typically a bowl-shaped feature within which contains either multiple vents or a singular vent. During volcanic eruptions, molten magma an ...
s and calderas, which fill up with precipitation more rapidly than they empty via either evaporation, groundwater discharge, or a combination of both. Sometimes the latter are called caldera lakes, although often no distinction is made. An example is
Crater Lake Crater Lake (Klamath language, Klamath: ''Giiwas'') is a Volcanic crater lake, crater lake in south-central Oregon in the western United States. It is the main feature of Crater Lake National Park and is famous for its deep blue color and water ...

Crater Lake
in
Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...

Oregon
, in the caldera of
Mount Mazama Mount Mazama (''Giiwas'' in the Native American language Klamath language, Klamath) is a complex volcano in the state of Oregon, United States, in a segment of the Cascade Volcanoes, Cascade Volcanic Arc and Cascade Range. Most of the mountain ...
. The caldera was created in a massive volcanic eruption that led to the
subsidence Subsidence is a general term for downward vertical movement of the Earth's surface, which can be caused by both natural processes and human activities. Subsidence involves little or no horizontal movement, which distinguishes it from slope move ...
of
Mount Mazama Mount Mazama (''Giiwas'' in the Native American language Klamath language, Klamath) is a complex volcano in the state of Oregon, United States, in a segment of the Cascade Volcanoes, Cascade Volcanic Arc and Cascade Range. Most of the mountain ...
around 4860 BCE. Other volcanic lakes are created when either rivers or streams are dammed by
lava flow Lava is magma Magma () is the molten or semi-molten natural material from which all s are formed. Magma is found beneath the surface of the , and evidence of has also been discovered on other and some s. Besides molten rock, magma may al ...

lava flow
s or volcanic
lahar , 1989 A lahar (, from jv, ꦮ꧀ꦭꦲꦂ) is a violent type of mudflow A mudflow or mud flow is a form of mass wasting Mass wasting, also known as slope movement or mass movement, is the geomorphic process by which soil Soil (often st ...
s. The basin which is now
Malheur Lake Malheur Lake is one of the lakes in the Malheur National Wildlife Refuge Malheur National Wildlife Refuge is a National Wildlife Refuge National Wildlife Refuge System is a designation for certain protected areas of the United States mana ...
,
Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...

Oregon
was created when a lava flow dammed the
Malheur River The Malheur River (local pronunciation: "MAL-hyure") is a tributary of the Snake River The Snake River is a major river of the greater Pacific Northwest region in the United States. At long, it is the largest tributary of the Columbia River, ...
. Among all lake types, volcanic crater lakes most closely approximate a circular shape.


Glacial lakes

Glacial lakes are lakes created by the direct action of glaciers and continental ice sheets. A wide variety of glacial processes create enclosed basins. As a result, there are a wide variety of different types of glacial lakes and it is often difficult to define clear-cut distinctions between different types of glacial lakes and lakes influenced by other activities. The general types of glacial lakes that have been recognized are lakes in direct contact with ice, glacially carved rock basins and depressions, morainic and outwash lakes, and glacial drift basins. Glacial lakes are the most numerous lakes in the world. Most lakes in
northern Europe Northern Europe is the northern region of Europe. Narrower definitions may describe Northern Europe as being roughly north of the southern coast of the Baltic Sea, which is about 54th parallel north, 54°N, or may be based on other geographic ...
and North America have been either influenced or created by the latest, but not last, glaciation, to have covered the region. Glacial lakes include
proglacial lake In geology, a proglacial lake is a lake formed either by the damming action of a moraine A moraine is any accumulation of unconsolidated debris (regolith and rock), sometimes referred to as glacial till, that occurs in both currently and fo ...
s,
subglacial lake A subglacial lake is a lake that is found under a glacier, typically beneath an ice cap or ice sheet. Subglacial lakes form at the boundary between ice and the underlying bedrock, where gravitational pressure decreases the pressure melting point o ...
s,
finger lake A finger lake, also known as either a fjord lake or trough lake, is "a narrow linear body of water occupying a glacially overdeepened valley and sometimes impounded by a morainic dam."Kotlyakov and Komarova (2007), 255. Where one end of a finger l ...
s, and epishelf lakes. Epishelf lakes are highly stratified lakes in which a layer of freshwater, derived from ice and snow melt, is dammed behind an
ice shelf An ice shelf is a large floating platform of ice that forms where a or flows down to a line and onto the ocean surface. Ice shelves are only found in , , , and the . The boundary between the floating ice shelf and the (resting on bedrock) ...
that is attached to the coastline. They are mostly found in Antarctica.


Fluvial lakes

Fluvial (or riverine) lakes are lakes produced by running water. These lakes include plunge pool lakes, fluviatile dams and meander lakes.


Oxbow lakes

The most common type of fluvial lake is a crescent-shaped lake called an ''
oxbow lake An oxbow lake is a U-shaped lake that forms when a wide meander of a river is Meander cutoff, cut off, creating a free-standing body of water. In south Texas, oxbows left by the Rio Grande are called ''resaca (channel), resacas''. In Australia ...

oxbow lake
'' due to the distinctive curved shape. They can form in river valleys as a result of meandering. The slow-moving river forms a sinuous shape as the outer side of bends are eroded away more rapidly than the inner side. Eventually a horseshoe bend is formed and the river cuts through the narrow neck. This new passage then forms the main passage for the river and the ends of the bend become silted up, thus forming a bow-shaped lake. Their crescent shape gives oxbow lakes a higher perimeter to area ratio than other lake types.


Fluviatile dams

These form where sediment from a tributary blocks the main river.


Lateral lakes

These form where sediment from the main river blocks a tributary, usually in the form of a
levee file:River Levee Cross Section Figure.svg, Components of a levee: file:Sacramento River Levee.jpg, The side of a levee in Sacramento, California A levee (), dike (American English), dyke (Commonwealth English), embankment, floodbank, or stop ...
.


Solution lakes

A solution lake is a lake occupying a basin formed by surface dissolution of bedrock. In areas underlain by soluble bedrock, its solution by precipitation and percolating water commonly produce cavities. These cavities frequently collapse to form
sinkhole A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are locally also known as vrtače and shakeholes, and to openings ...

sinkhole
s that form part of the local
karst topography Karst is a topography formed from the dissolution of soluble rocks such as limestone Limestone is a common type of carbonate rock, carbonate sedimentary rock. It is composed mostly of the minerals calcite and aragonite, which are differe ...
. Where
groundwater Groundwater is the water Water (chemical formula H2O) is an , transparent, tasteless, odorless, and , which is the main constituent of 's and the s of all known living organisms (in which it acts as a ). It is vital for all known form ...

groundwater
lies near the grounds surface, a sinkhole will be filled water as a solution lake. If such a lake consists of a large area of standing water that occupies an extensive closed depression in limestone, it is also called a karst lake. Smaller solution lakes that consist of a body of standing water in a closed depression within a karst region are known as ''karst ponds.''Neuendorf, K.K.E., Mehl Jr., J.P., and Jackson, J.A. (2005). ''Glossary of Geology,'' 5th revised and enlarged ed. Berlin: Springer. Approx. . Limestone caves often contain pools of standing water, which are known as '' underground lakes.'' Classic examples of solution lakes are abundant in the karst regions at the
Dalmatian coast Dalmatia (; hr, Dalmacija ; it, Dalmazia; see #Name, names in other languages) is one of the four historical region, historical regions of Croatia, alongside Croatia proper, Slavonia, and Istria. Dalmatia is a narrow belt of the east shore o ...

Dalmatian coast
of
Croatia , image_flag = Flag of Croatia.svg , image_coat = Coat of arms of Croatia.svg , anthem = "Lijepa naša domovino ''Lijepa naša domovino'' (; ) is the national anthem A national anthem is a song that ...

Croatia
and within large parts of
Florida Florida is a U.S. state, state located in the Southeastern United States, Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia (U.S. state), Geor ...

Florida
.


Landslide lakes

A landslide lake is created by the blockage of a
river valley A valley is an elongated low area often running between hills or mountains, which will typically contain 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 ...
by either
mudflow A mudflow or mud flow is a form of mass wasting Mass wasting, also known as mass movement, is a general term for the movement of rock Rock most often refers to: * Rock (geology) A rock is any naturally occurring solid mass or aggreg ...
s,
rockslide A rockslide is a type of landslide The term landslide or, less frequently, landslip refers to several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated slope failures, mudflows, and debri ...
s, or
scree Scree is a collection of broken rock Rock most often refers to: * Rock (geology) A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its Chemical compound ...

scree
s. Such lakes are most common in mountainous regions. Although landslide lakes may be large and quite deep, they are typically short-lived. An example of a landslide lake is
Quake Lake Quake Lake (officially Earthquake Lake) is a lake in southwestern Montana in the United States. It was created after an earthquake struck on August 17, 1959, killing 28 people. Quake Lake is deep and long. US 287 follows the lake and offers g ...
, which formed as a result of the
1959 Hebgen Lake earthquake The 1959 Hebgen Lake earthquake (also known as the 1959 Yellowstone earthquake) occurred on August 17 at 11:37 pm (MST) in southwestern Montana, United States. The earthquake measured 7.2 on the Moment magnitude scale, caused a huge landslide, r ...
. Most landslide lakes disappear in the first few months after formation, but a landslide dam can burst suddenly at a later stage and threaten the population downstream when the lake water drains out. In 1911, an earthquake triggered a landslide that blocked a deep valley in the
Pamir Mountains The Pamir Mountains are a mountain range A mountain range is a series of mountains ranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignme ...

Pamir Mountains
region of
Tajikistan ) , image_map = Tajikistan (orthographic projection).svg , map_caption = , capital = Dushanbe Dushanbe ( tg, Душанбе, ; ; russian: Душанбе) is the Capital city, capital and largest ...

Tajikistan
, forming the
Sarez Lake Sarez Lake (russian: Сарезское озеро; tg, Сарез) is a lake in Rushon District of Gorno-Badakhshan province, Tajikistan ) File:Tajikistan anthem.ogg, center , image_map = Tajikistan (orthographic projecti ...
. The
Usoi Dam The Usoi Dam is a natural landslide dam A landslide dam or barrier lake is a natural damming of a river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a rive ...
at the base of the valley has remained in place for more than 100 years but the terrain below the lake is in danger of a catastrophic flood if the dam were to fail during a future earthquake.


Aeolian lakes

Aeolian lakes are produced by wind action. These lakes are found mainly in
arid A region is arid when it is characterized by a severe lack of available water, to the extent of hindering or preventing the growth and development Development or developing may refer to: Arts *Development hell, when a project is stuck in d ...

arid
environments, although some aeolian lakes are
relict A relict is a surviving remnant of a natural phenomenon. Biology A relict (or relic) is an organism that at an earlier time was abundant in a large area but now occurs at only one or a few small areas. Geology and geomorphology In geology ...
landforms indicative of arid
paleoclimate Paleoclimatology (British spelling Despite the various English dialects spoken from country to country and within different regions of the same country, there are only slight regional variations in English orthography English orthograp ...
s. Aeolian lakes consist of lake basins dammed by wind-blown sand; interdunal lakes that lie between well-oriented
sand dune A dune is a landform A landform is a natural or artificial feature of 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. Land ...

sand dune
s; and deflation basins formed by wind action under previously arid paleoenvironments.
Moses Lake Moses Lake is a lake and reservoir along the course of Crab Creek, in Washington (state), Washington state, United States, USA. Moses Lake is part of the Columbia River basin, as Crab Creek is a tributary of the Columbia River. Although original ...
in
Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** Federal government of the United States (metonym) ** Washington metropolitan area, the metropolitan area centered on Washingt ...
, United States, was originally a shallow natural lake and an example of a lake basin dammed by wind-blown sand. China's
Badain Jaran Desert The Badain Jaran Desert () is a desert in China China (), officially the People's Republic of China (PRC; ), is a country in . It is the world's , with a of more than 1.4 billion. China spans five geographical and 14 different countries ...
is a unique landscape of megadunes and elongated interdunal aeolian lakes, particularly concentrated in the southeastern margin of the desert.


Shoreline lakes

Shoreline lakes are generally lakes created by blockage of estuaries or by the uneven accretion of beach ridges by longshore and other currents. They include maritime coastal lakes, ordinarily in drowned estuaries; lakes enclosed by two tombolos or spits connecting an island to the mainland; lakes cut off from larger lakes by a bar; or lakes divided by the meeting of two spits.


Organic lakes

Organic lakes are lakes created by the actions of plants and animals. On the whole they are relatively rare in occurrence and quite small in size. In addition, they typically ephemeral features relative to the other types of lakes. The basins in which organic lakes occur are associated with beaver dams, coral lakes, or dams formed by vegetation.


Peat lakes

Peat Peat (), also known as turf (), is an accumulation of partially decayed vegetation Vegetation is an assemblage of species and the they provide. It is a general term, without specific reference to particular , life forms, structure, ...
lakes are a form of organic lake. They form where a buildup of partly decomposed plant material in a wet environment leaves the vegetated surface below the
water table The water table is the upper surface of the Phreatic zone, zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with water. It can also be simply explained as the depth below which the ground is ...

water table
for a sustained period of time. They are often low in nutrients and mildly acidic, with bottom waters low in dissolved oxygen.


Anthropogenic lakes

Anthropogenic lakes are artificially created as a result of human activity. They can be formed by the intentional damming of rivers and streams or the subsequent filling of abandoned excavations by either ground water, precipitation, or a combination of both. The
Upper Silesia Upper Silesia ( pl, Górny Śląsk; szl, Gōrny Ślōnsk; cs, Horní Slezsko; german: Oberschlesien; Silesian German: ; la, Silesia Superior) is the southeastern part of the historical and geographical region of Silesia, located mostly in Poland, ...
n region of Southern Poland contains an anthropogenic lake district consisting of more than 4,000 water bodies created by human activity. The diverse origins of these lakes include: reservoirs retained by dams, flooded mines, water bodies formed in subsidence basins and hollows,
levee file:River Levee Cross Section Figure.svg, Components of a levee: file:Sacramento River Levee.jpg, The side of a levee in Sacramento, California A levee (), dike (American English), dyke (Commonwealth English), embankment, floodbank, or stop ...

levee
ponds, and residual water bodies following river regulation.


Meteorite (extraterrestrial impact/crater) lakes

Meteorite lakes, which are also known as crater lakes, are lakes created by catastrophic by either
meteorite A meteorite is a solid piece of debris from an object, such as a comet A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process that is called outgassing. This produces ...
s or
asteroid An asteroid is a minor planet of the Solar System#Inner solar system, inner Solar System. Historically, these terms have been applied to any astronomical object orbiting the Sun that did not resolve into a disc in a telescope and was not observ ...

asteroid
s. Examples of meteorite lakes are
Lonar crater lake Lonar Lake, also known as Lonar crater, is a notified National Geo-heritage Monument,
,
India India, officially the Republic of India (Hindi Hindi (Devanagari: , हिंदी, ISO 15919, ISO: ), or more precisely Modern Standard Hindi (Devanagari: , ISO 15919, ISO: ), is an Indo-Aryan language spoken chiefly in Hindi Belt, ...

India
,
Lake Elgygytgyn Lake El'gygytgyn (Russian language, Russian and Chukchi language, Chukchi: Эльгыгытгын) is an impact crater lake located in the Chukotka Autonomous Okrug in northeast Siberia, about southeast of Chaunskaya Bay. The word "Elgygytgyn" me ...
, Siberia, and
Pingualuit crater The Pingualuit Crater (french: Cratère des Pingualuit; from Inuit "pimple"), formerly called the "Chubb Crater" and later the "New Quebec Crater" (french: Cratère du Nouveau-Québec), is a relatively young impact crater located on the Ungava Pen ...
lake, Quebec, Canada, As in case of Lake El'gygytgyn and Pingualuit crater lake, meteorite (extraterrestrial impact/ crater) lakes can contain unique and scientifically valuable sedimentary deposits associated with long records of paleoclimatic changes.


Other classification methods

In addition to the mode of origin, lakes have been named and classified according to various other important factors such as thermal stratification, oxygen saturation, seasonal variations in lake volume and water level, salinity of the water mass, relative seasonal permanence, degree of outflow, and so on. The names used by the lay public and in the scientific community for different types of lakes are often informally derived from the morphology of the lakes' physical characteristics or other factors. Also, different cultures and regions of the world have their own popular nomenclature.


According to thermal stratification

One important method of lake classification is on the basis of thermal stratification, which has a major influence on the animal and plant life inhabiting a lake, and the fate and distribution of dissolved and suspended material in the lake. For example, the thermal stratification, as well as the degree and frequency of mixing, has a strong control over the distribution of oxygen within the lake. Professor F.-A. Forel,Forel, F.A., 1901. ''Handbuch der Seenkunde. Allgemeine Limnologie.'' J. von Engelhorn, Stuttgart, Germany. also referred to as the "Father of limnology", was the first scientist to classify lakes according to their thermal stratification. His system of classification was later modified and improved upon by
HutchinsonHutchinson may refer to: Places United States * Hutchinson, Kansas * South Hutchinson, Kansas * Hutchinson, Minnesota * Hutchinson, Pennsylvania * Hutchinson, West Virginia, in Logan County * Hutchinson, Marion County, West Virginia * Hutchinso ...
and Löffler. As the density of water varies with temperature, with a maximum at +4 degrees Celcius, thermal stratification is an important physical characteristic of a lake that controls the fauna and flora, sedimentation, chemistry, and other aspects of individual lakes. First, the colder, denser water typically forms a layer near the bottom, which is called the ''hypolimnion''. Second, normally overlying the hypolimnion is a transition zone known as the ''metalimnion''. Finally, overlying the metalimnion is a surface layer of warmer water with a lower density, called the ''epilimnion''. This typical stratification sequence can vary widely, depending on the specific lake or the time of year, or a combination of both. The classification of lakes by thermal stratification presupposes lakes with sufficient depth to form a hypolimnion; accordingly, very shallow lakes are excluded from this classification system. Based upon their thermal stratification, lakes are classified as either ''holomictic lake, holomictic'', with a uniform temperature and density from top to bottom at a given time of year, or ''meromictic lake, meromictic'', with layers of water of different temperature and density that do not intermix. The deepest layer of water in a meromictic lake does not contain any dissolved oxygen so there are no living aerobic organisms. Consequently, the layers of sediment at the bottom of a meromictic lake remain relatively undisturbed, which allows for the development of lacustrine deposits. In a holomictic lake, the uniformity of temperature and density allows the lake waters to completely mix. Based upon thermal stratification and frequency of turnover, holomictic lakes are divided into amictic lakes, cold monomictic lakes, dimictic lakes, warm monomictic lakes, polymictic lakes, and oligomictic lakes. Lake stratification does not always result from a variation in density because of thermal gradients. Stratification (water), Stratification can also result from a density variation caused by gradients in salinity. In this case, the hypolimnion and epilimnion are separated not by a thermocline but by a ''halocline'', which is sometimes referred to as a ''chemocline''.


According to seasonal variations in water level and volume

Lakes are informally classified and named according to the seasonal variation in their lake level and volume. Some of the names include: * Ephemeral lake is a short-lived lake or pond. If it fills with water and dries up (disappears) seasonally it is known as an ''intermittent lake''Poehls, D.J. and Smith, G.J. eds. (2009). ''Encyclopedic dictionary of hydrogeology.'' Academic Press. p. 517. They often fill poljes. * Dry lake is a popular name for an ephemeral lake that contains water only intermediately at irregular and infrequent intervals.Last, W.M. and Smol, J.P. (2001). ''Tracking environmental change using lake sediments. Volume 1: basin analysis, coring, and chronological techniques.'' Springer Science & Business Media. * Perennial lake is a lake that has water in its basin throughout the year and is not subject to extreme fluctuations in level.Gangstad, E.O., (1979)
''Glossary of Biolimnological Terms''
Washington, DC, United States Army Corps of Engineers.
* Playa lake is a typically shallow, intermittent lake that covers or occupies a playa either in wet seasons or in especially wet years but subsequently drying up in an arid or semiarid region. * Vlei is a name used in South Africa for a shallow lake which varies considerably in level with the seasons.Theal, G.M., 1877. ''Compendium of South African history and geography, 3rd.'' Institution Press, Lovedale, South Africa.


According to water chemistry

Lakes are also informally classified and named according to the general chemistry of their water mass. Some of the types of lakes include: * An acid lake is a lake that has a pH is below neutral (<6.5). A lake is considered highly acidic when the pH drops below 5.5, below which when biological consequences occur. Such lakes include acid pit lakes occupying abandoned mines and excavations; naturally acid lakes of igneous and metamorphic landscapes; peat bogs in northern regions; acid-saline lakes of arid environments; crater lakes of active and dormant volcanoes; and lakes acidified by acid rain.Geller, W. et al. (eds.) (2013). ''Acidic Pit Lakes, Environmental Science and Engineering'', Springer-Verlag Berlin HeidelbergRouwet, D. et al. (eds.) (2015). ''Volcanic Lakes, Advances in Volcanology,'' Springer-Verlag Berlin Heidelberg * A salt lake, which also known as a ''brine lake'', is an inland body of water situated in an arid or semiarid region, having no outlet to the sea, and containing a high concentration of dissolved salts (principally sodium chloride). Examples include the Great Salt Lake in Utah, and the Dead Sea in the Near East. * Alkali sink, also known as salt flats, are lakes on the other extreme of the scale from the large and deep saline lakes. They are, shallow saline features that occupy low-lying areas of the arid regions and in groundwater discharge zones. These are typically classifiable as either playas or playa lakes because they are periodically flooded by either rain or flood events and then dry up during drier intervals, leaving accumulations of brines and evaporitic minerals. * A Salt pan (geology), salt pan (saltpan) is either an undrained small shallow natural depression in which water accumulates and evaporates leaving a salt deposit or the shallow lake of brackish water occupying a salt pan. This term is also used for a large pan for recovering salt by evaporation. * A saline pan is a name for an ephemeral saline lake which precipitates a bottom crust that is subsequently modified during subaerial exposure.


Lakes composed of other liquids

* Lava lake is a large volume of molten lava, usually basaltic, contained in a volcanic vent, crater, or broad depression. * Lakes of Titan, Hydrocarbon lakes are bodies of liquid ethane and methane that occupy depressions on the surface of
Titan Titan most often refers to: * Titan (moon), the largest moon of Saturn * Titans, a race of deities in Greek mythology Titan or Titans may also refer to: Arts and entertainment Fictional entities Fictional locations * Titan in fiction, fictional ...
. They were detected by the Cassini–Huygens space probe.


Paleolakes

A paleolake (also palaeolake) is a lake that existed in the past when hydrological conditions were different. Quaternary paleolakes can often be identified on the basis of
relict A relict is a surviving remnant of a natural phenomenon. Biology A relict (or relic) is an organism that at an earlier time was abundant in a large area but now occurs at only one or a few small areas. Geology and geomorphology In geology ...
lacustrine landforms, such as relict lake plains and coastal landforms that form recognizable relict shorelines called ''paleoshorelines.'' Paleolakes can also be recognized by characteristic sedimentary deposits that accumulated in them and any fossils that might be contained in these sediments. The paleoshorelines and sedimentary deposits of paleolakes provide evidence for prehistoric hydrological changes during the times that they existed.Goudie, A. (2008). "Arid Climates and Indicators". Gornitz, V. ed., ''Encyclopedia of paleoclimatology and ancient environments''. Springer Science & Business Media. pp. 45–51. There are two types of paleolake: * A :Former lakes, former lake is a paleolake that no longer exists. Such lakes include prehistoric lakes and those that have permanently dried up, often as the result of either evaporation or human intervention. An example of a former lake is Owens Lake in California, United States. Former lakes are a common feature of the Basin and Range Province, Basin and Range area of southwestern North America. * A shrunken lake is a paleolake that still exists but has considerably decreased in size over geological time. An example of a shrunken lake is Lake Agassiz, which once covered much of central North America. Two notable remnants of Lake Agassiz are Lake Winnipeg and Lake Winnipegosis. Paleolakes are of scientific and economic importance. For example, Quaternary paleolakes in semidesert basins are important for two reasons: they played an extremely significant, if transient, role in shaping the floors and piedmont (geography), piedmonts of many basins; and their sediments contain enormous quantities of geologic and paleontologic information concerning past environments. In addition, the organic-rich deposits of pre-Quaternary paleolakes are important either for the thick deposits of oil shale and shale gas contained in them, or as source rocks of petroleum and natural gas. Although of significantly less economic importance, strata deposited along the shore of paleolakes sometimes contain coal seams.Gierlowski-Kordesch, E. and Kelts, K.R. eds. (2000). ''Lake Basins Through Space and Time''. AAPG Studies in Geology 46 (No. 46). The American Association of Petroleum Geologists, Tulsa, OK


Characteristics

Lakes have numerous features in addition to lake type, such as drainage basin (also known as catchment area), inflow and outflow, nutrient content, dissolved oxygen, water pollution, pollutants, pH, and
sediment Sediment is a naturally occurring material that is broken down by processes of weathering Weathering is the deterioration of rocks A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is cate ...

sediment
ation. Changes in the level of a lake are controlled by the difference between the input and output compared to the total volume of the lake. Significant input sources are precipitation onto the lake, runoff carried by streams and channels from the lake's drainage basin, catchment area,
groundwater Groundwater is the water Water (chemical formula H2O) is an , transparent, tasteless, odorless, and , which is the main constituent of 's and the s of all known living organisms (in which it acts as a ). It is vital for all known form ...

groundwater
channels and aquifers, and artificial sources from outside the catchment area. Output sources are evaporation from the lake, surface and groundwater flows, and any extraction of lake water by humans. As climate conditions and human water requirements vary, these will create fluctuations in the lake level. Lakes can be also Trophic state index, categorized on the basis of their richness in nutrients, which typically affect plant growth. Nutrient-poor lakes are said to be ''oligotrophic'' and are generally clear, having a low concentration of plant life. ''Mesotrophic lakes'' have good clarity and an average level of nutrients. ''Eutrophic'' lakes are enriched with nutrients, resulting in good plant growth and possible algal blooms. ''eutrophication, Hypertrophic'' lakes are bodies of water that have been excessively enriched with nutrients. These lakes typically have poor clarity and are subject to devastating algal blooms. Lakes typically reach this condition due to human activities, such as heavy use of fertilizers in the lake catchment area. Such lakes are of little use to humans and have a poor ecosystem due to decreased dissolved oxygen. Due to the unusual relationship between water's temperature and its density, lakes form layers called thermoclines, layers of drastically varying temperature relative to depth. Fresh water is most dense at about 4 degrees Celsius (39.2 °F) at sea level. When the temperature of the water at the surface of a lake reaches the same temperature as deeper water, as it does during the cooler months in temperate climates, the water in the lake can mix, bringing oxygen-starved water up from the depths and bringing oxygen down to decomposing sediments. Deep temperate lakes can maintain a reservoir of cold water year-round, which allows some cities to tap that reservoir for deep lake water cooling. Since the surface water of deep tropical lakes never reaches the temperature of maximum density, there is no process that makes the water mix. The deeper layer becomes oxygen starved and can become saturated with carbon dioxide, or other gases such as sulfur dioxide if there is even a trace of volcano, volcanic activity. Exceptional events, such as earthquakes or landslides, can cause mixing which rapidly brings the deep layers up to the surface and release a vast cloud of gas which lay trapped in solution in the colder water at the bottom of the lake. This is called a limnic eruption. An example is Lake Nyos#The 1986 disaster, the disaster at Lake Nyos in Cameroon. The amount of gas that can be dissolved in water is directly related to pressure. As deep water surfaces, the pressure drops and a vast amount of gas comes out of solution. Under these circumstances carbon dioxide is hazardous because it is heavier than air and displaces it, so it may flow down a river valley to human settlements and cause mass asphyxiation. The material at the bottom of a lake, or ''lake bed'', may be composed of a wide variety of inorganics, such as silt or sand, and organic material, such as decaying plant or animal matter. The composition of the lake bed has a significant impact on the flora and fauna found within the lake's environs by contributing to the amounts and the types of nutrients available. A paired (black and white) layer of the varved lake sediments correspond to a year. During winter, when organisms die, carbon is deposited down, resulting to a black layer. At the same year, during summer, only few organic materials are deposited, resulting to a white layer at the lake bed. These are commonly used to track past paleontological events. Natural lakes provide a Macrocosm and microcosm, microcosm of living and nonliving elements that are relatively independent of their surrounding environments. Therefore, lake organisms can often be studied in isolation from the lake's surroundings.


Limnology

Limnology is the study of inland bodies of water and related ecosystems. Limnology divides lakes into three zones: the ''littoral zone'', a sloped area close to land; the ''photic zone, photic'' or ''open-water zone'', where sunlight is abundant; and the deep-water ''profundal zone, profundal'' or ''benthic zone'', where little sunlight can reach. The depth to which light can penetrate depends on the turbidity of the water, which is determined by the density and size of suspended Particle (ecology), particles. A particle will be in Suspension (chemistry), suspension if its weight is less than the random turbidity forces acting upon it. These particles can be sedimentary or Biotic material, biological in origin (including algae and detritus) and are responsible for the color of the water. Decaying plant matter, for instance, may account for a yellow or brown color, while algae may cause a greenish coloration. In very shallow water bodies, iron oxides make the water reddish brown. Bottom-dwelling detritivorous fish stir the mud in search of food and can be the cause of turbid waters. Piscivorous fish contribute to turbidity by eating plant-eating (planktonivorous) fish, thus increasing the amount of algae (see aquatic trophic cascade). The light depth or transparency is measured using a ''Secchi disk'', a 20-cm (8 in) disk with alternating white and black Circular sector, quadrants. The depth at which the disk is no longer visible is the ''Secchi depth'', a measure of transparency. The Secchi disk is commonly used to test for eutrophication. For a detailed look at these processes, see lentic ecosystems. A lake moderates the surrounding region's temperature and climate because water has a very high specific heat capacity (4,186 J·kg−1·K−1). In the daytime a lake can cool the land beside it with local winds, resulting in a sea breeze; in the night it can warm it with a land breeze.


Biological properties

Lake zones: * ''Epilittoral'': The zone that is entirely above the lake's normal water level and never submerged by lake water * ''Littoral'': The zone that encompasses the small area above the normal water level (which is sometimes submerged when the lake's water level increases), reaching to the deepest part of the lake that still allows for submerged Aquatic plant, macrophytic growth * ''Littoriprofundal'': Transition zone commonly aligned with stratified lakes' metalimnions – too deep for macrophytes but includes photosynthetic algae and bacteria * ''Profundal'': Sedimentary zone containing no vegetation Algal community types: * ''Epipelic'': Algae that grow on sediments * ''Epilithic'': Algae that grow on rocks * ''Epipsammic'': Algae that grow on (or within) sand * ''Epiphytic'': Algae that grow on macrophytes * ''Epizooic'': Algae that grow on living animals * ''Metaphyton'': Algae present in the littoral zone, not in a state of suspension nor attached to a substratum (such as a macrophyte)


Circulation


Flora and fauna


Disappearance

The lake may be infilled with deposited sediment and gradually become a wetland such as a swamp or marsh. Large water plants, typically Phragmites, reeds, accelerate this closing process significantly because they partially decompose to form peat soils that fill the shallows. Conversely, peat soils in a marsh can naturally burn and reverse this process to recreate a shallow lake resulting in a dynamic equilibrium between marsh and lake. This is significant since wildfire has been largely suppressed in the developed world over the past century. This has artificially converted many shallow lakes into emergent marshes. Turbid lakes and lakes with many plant-eating fish tend to disappear more slowly. A "disappearing" lake (barely noticeable on a human timescale) typically has extensive plant mats at the water's edge. These become a new habitat for other plants, like Sphagnum, peat moss when conditions are right, and animals, many of which are very rare. Gradually, the lake closes and young peat may form, forming a fen. In lowland river valleys where a river can meander, the presence of peat is explained by the infilling of historical
oxbow lake An oxbow lake is a U-shaped lake that forms when a wide meander of a river is Meander cutoff, cut off, creating a free-standing body of water. In south Texas, oxbows left by the Rio Grande are called ''resaca (channel), resacas''. In Australia ...

oxbow lake
s. In the final stages of Ecological succession, succession, trees can grow in, eventually turning the wetland into a forest. Some lakes can disappear seasonally. These are called intermittent lakes, ephemeral lakes, or seasonal lakes and can be found in Karst, karstic terrain. A prime example of an intermittent lake is Lake Cerknica in Slovenia or Lag Prau Pulte in Graubünden. Other intermittent lakes are only the result of above-average precipitation in a closed, or
endorheic basin An endorheic basin (; also spelled endoreic basin or endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but drainage converges instead into lakes ...
, usually filling dry lake beds. This can occur in some of the driest places on earth, like Death Valley. This occurred in the spring of 2005, after unusually heavy rains. The lake did not last into the summer, and was quickly evaporated (see photos to right). A more commonly filled lake of this type is Sevier Lake of west-central Utah. Sometimes a lake will disappear quickly. On 3 June 2005, in Nizhny Novgorod Oblast, Russia, a lake called Lake Beloye (Nizhny Novgorod Oblast), Lake Beloye vanished in a matter of minutes. News sources reported that government officials theorized that this strange phenomenon may have been caused by a shift in the soil underneath the lake that allowed its water to drain through channels leading to the Oka River. The presence of ground permafrost is important to the persistence of some lakes. Thawing permafrost may explain the shrinking or disappearance of hundreds of large Arctic lakes across western Siberia. The idea here is that rising air and soil temperatures thaw permafrost, allowing the lakes to drain away into the ground. Some lakes disappear because of human development factors. The shrinking Aral Sea is described as being "murdered" by the diversion for irrigation of the rivers feeding it.


Extraterrestrial lakes

Only one world other than Earth is known to harbor large lakes, Saturn's largest moon,
Titan Titan most often refers to: * Titan (moon), the largest moon of Saturn * Titans, a race of deities in Greek mythology Titan or Titans may also refer to: Arts and entertainment Fictional entities Fictional locations * Titan in fiction, fictional ...
. Photographs and spectroscopic analysis by the Cassini–Huygens spacecraft show liquid ethane on the surface, which is thought to be mixed with liquid methane. The largest Titanean lake, Kraken Mare at 400,000 km2, is three-times the size of any lake on Earth, and even the second, Ligeia Mare, is estimated to be slightly larger than Earth's Lake Michigan–Huron. Jupiter's large moon Io (moon), Io is volcanically active, and as a result sulfur deposits have accumulated on the surface. Some photographs taken during the Galileo spacecraft, Galileo mission appear to show lakes of liquid sulfur in volcanic caldera, though these are more analogous to lake of lava than of water on Earth. The planet Mars has only one confirmed lake; it is underground and near the south pole. However, the surface of Mars is too cold and has too little atmospheric pressure to permit permanent surface water. Geologic evidence appears to confirm, however, that ancient lakes once formed on the surface. It is also possible that volcanic activity on Mars will occasionally melt subsurface ice, creating large temporary lakes. This water would quickly freeze and then sublimate, unless insulated in some manner, such as by a coating of volcanic ash. There are dark basaltic plains on the Moon, similar to lunar mare, lunar maria but smaller, that are called ''lacus'' (singular ''lacus'', Latin for "lake") because they were thought by early astronomers to be lakes of water.


Notable lakes on Earth

* The largest lake by surface area is
Caspian Sea The Caspian Sea (also known as Mazandaran Sea, Hyrcanian Ocean, or Khazar Sea), tk, Hazar deňzi, az, Xəzər Dənizi, russian: Каспийское море, script=Latn, fa, دریای مازندران، دریای خزر, script=Latn, tly, ...

Caspian Sea
, which is despite its name considered as a lake from the point of view of geography. Its surface area is 143,000 sq. mi./371,000 km2. * The second largest lake by surface area, and the largest freshwater lake by surface area, is Lake Michigan-Huron, which is hydrologically a single lake. Its surface area is 45,300 sq. mi./117,400 km2. For those who consider Lake Michigan-Huron to be separate lakes, and Caspian Sea to be a sea, Lake Superior would be the largest lake at 82,100 km2 (31,700 square miles) *
Lake Baikal Lake Baikal (; russian: Oзеро Байкал, Ozero Baykal ; bua, Байгал далай, Baigal dalai; mn, Байгал нуур, Baigal nuur) is a rift lake A rift lake is a lake A lake is an area filled with water, localized in ...

Lake Baikal
is the deepest lake in the world, located in Siberia, with a bottom at . Its mean depth is also the greatest in the world ().
It is also the world's largest freshwater lake by volume (, but much smaller than the Caspian Sea at ), and the second longest (about from tip to tip). * The world's ancient lake, oldest lake is
Lake Baikal Lake Baikal (; russian: Oзеро Байкал, Ozero Baykal ; bua, Байгал далай, Baigal dalai; mn, Байгал нуур, Baigal nuur) is a rift lake A rift lake is a lake A lake is an area filled with water, localized in ...

Lake Baikal
, followed by Lake Tanganyika in Tanzania. Lake Maracaibo is considered by some to be the second-oldest lake on Earth, but since it lies at sea level and nowadays is a contiguous body of water with the sea, others consider that it has turned into a small bay. * The longest lake is Lake Tanganyika, with a length of about (measured along the lake's center line).
It is also the third largest by volume, the second oldest, and the second deepest () in the world, after Lake Baikal. * The world's highest lake, if size is not a criterion, may be the crater lake of Ojos del Salado, at . * The highest large (greater than ) lake in the world is the Lake Puma Yumco, Pumoyong Tso (Pumuoyong Tso), in the Tibet Autonomous Region of China, at , above sea level. * The world's highest commercially navigable lake is Lake Titicaca in Peru and Bolivia at . It is also the largest lake in South America. * The world's lowest lake is the
Dead Sea The Dead Sea ( he, יָם הַמֶּלַח lit. Sea of Salt; ar, البحر الميت , lit. ''the Dead Sea'',The first article ''al-'' is unnecessary and usually not used. or Buhayrat, Bahret or Birket Lut, ''lit.'' "Lake/Sea of Lot") is a s ...

Dead Sea
, bordered by Jordan to the east and Israel and State of Palestine, Palestine to the west, at below sea level. It is also one of the lakes with highest
salt Salt is a mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure fo ...

salt
concentration. * Lake Michigan–Huron has the longest lake coastline in the world: about , excluding the coastline of its many inner islands. Even if it is considered two lakes, Lake Huron alone would still have the longest coastline in the world at . * The largest island in a lake is Manitoulin Island in Lake Michigan–Huron, Lake Michigan-Huron, with a surface area of . Lake Manitou, on Manitoulin Island, is the largest lake on an island in a lake. * The largest lake on an island is Nettilling Lake on Baffin Island, with an area of and a maximum length of . * The largest lake in the world that drains naturally in two directions is Wollaston Lake. * Lake Toba on the island of Sumatra is in what is probably the largest resurgent caldera on Earth. * The largest lake completely within the boundaries of a single city is Lake Wanapitei in the city of Greater Sudbury, Sudbury, Ontario, Canada. Before the current city boundaries came into effect in 2001, this status was held by Lake Ramsey, also in Sudbury. * Lake Enriquillo in Dominican Republic is the only saltwater lake in the world inhabited by crocodiles. * Lake Bernard, Ontario, Canada, claims to be the largest lake in the world with no islands. * Lake Saimaa in both South Savonia and South Karelia, Finland, forms the much larger Saimaa basin, which have more shorelines per unit of area than anywhere else in the world, with the total length being nearly . * The largest lake in one country is Lake Michigan, in the United States. However, it is sometimes considered part of Lake Michigan-Huron, making the record go to Great Bear Lake, Northwest Territories, in
Canada Canada is a country in the northern part of North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean, Atlantic to the Pacific Ocean, Pacific and northward into the Arctic Oce ...

Canada
, the largest lake within one jurisdiction. * The largest lake on an island in a lake on an island is Crater Lake on Vulcano Island in Lake Taal on the island of Luzon, The Philippines. * The northernmost named lake on Earth is Upper Dumbell Lake in the Qikiqtaaluk Region of Nunavut,
Canada Canada is a country in the northern part of North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean, Atlantic to the Pacific Ocean, Pacific and northward into the Arctic Oce ...

Canada
at a latitude of 82°28'N. It is southwest of Alert, Nunavut, Alert, the northernmost settlement in the world. There are also several small lakes north of Upper Dumbell Lake, but they are all unnamed and only appear on very detailed maps.


Largest by continent

The largest lakes (surface area) by continent are: * Australia –
Lake Eyre Lake Eyre ( ), Dual naming, officially known as Kati Thanda–Lake Eyre, is an endorheic lake in east-central Far North (South Australia), Far North South Australia, some north of Adelaide. The shallow lake is the depocentre of the vast endorh ...

Lake Eyre
(salt lake) * Africa – Lake Victoria, also the third-largest freshwater lake on Earth. It is one of the Great Lakes of Africa. * Antarctica – Lake Vostok (subglacial) * Asia –
Lake Baikal Lake Baikal (; russian: Oзеро Байкал, Ozero Baykal ; bua, Байгал далай, Baigal dalai; mn, Байгал нуур, Baigal nuur) is a rift lake A rift lake is a lake A lake is an area filled with water, localized in ...

Lake Baikal
(if the
Caspian Sea The Caspian Sea (also known as Mazandaran Sea, Hyrcanian Ocean, or Khazar Sea), tk, Hazar deňzi, az, Xəzər Dənizi, russian: Каспийское море, script=Latn, fa, دریای مازندران، دریای خزر, script=Latn, tly, ...

Caspian Sea
is considered a lake, it is the largest in Eurasia, but is divided between the two geographic continents) * Oceania –
Lake Eyre Lake Eyre ( ), Dual naming, officially known as Kati Thanda–Lake Eyre, is an endorheic lake in east-central Far North (South Australia), Far North South Australia, some north of Adelaide. The shallow lake is the depocentre of the vast endorh ...

Lake Eyre
when filled; the largest permanent (and freshwater) lake in Oceania is Lake Taupo. * Europe – Lake Ladoga, followed by Lake Onega, both in northwestern Russia. * North America – Lake Michigan–Huron, which is hydrologically a single lake. However, lakes Lake Huron, Huron and Lake Michigan, Michigan are usually considered separate lakes, in which case Lake Superior would be the largest. * South America – Lake Titicaca, which is also the highest navigable body of water on Earth at above sea level. The much larger Lake Maracaibo is much older, but perceived by some to no longer be genuinely a lake for multiple reasons.


See also


Notes


References


External links


ILEC World Lake Database

LakeNet Global Lake Database
{{Authority control Lakes, Bodies of water Lacustrine landforms