Underground lake

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Subterranean isle on one of the 22 lakes in Križna jama
Subterranean isle on one of the 22 lakes in Križna jama

An underground lake or a subterranean lake is a lake which is formed under the surface of the Earth's crust. Such a lake may be associated with caves, aquifers, or springs. They are typically very low in salinity.

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