![]() Some parts of the world have many lakes formed by the chaotic drainage patterns left over from the last ice age. Other lakes are found in depressed landforms or along the courses of mature rivers, where a river channel has widened over a basin formed by eroded floodplains and wetlands. alpine lakes), dormant volcanic craters, rift zones and areas with ongoing glaciation. Natural lakes are generally found in mountainous areas (i.e. Lakes are also distinct from lagoons, which are shallow tidal pools dammed by sandbars at coastal regions. Most lakes are both fed and drained by creeks and rivers, but some lakes are endorheic without any outflow, while volcanic lakes are filled directly by precipitation runoffs and do not have any inflow streams. Lakes are typically much larger and deeper than ponds, which are also water-filled basins on land, although there are no official definitions or scientific criteria distinguishing the two. Most lakes are freshwater and account for almost all the world's surface freshwater, but some are salt lakes with salinities even higher than that of seawater. ![]() Lakes lie completely on land and are separate from the ocean, although, like the much larger oceans, they form part of the Earth's water cycle by serving as large standing pools of storage water. A lake generally has a slower-moving flow than the inflow or outflow stream(s) that serve to feed or drain it. Lac Gentau lake at the Ossau Valley, Pyrenees, FranceĪ lake is a naturally occurring, relatively large body of water localized in a basin surrounded by dry land.
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