Circular crater lake in SW Oregon, USA, in the Cascade Range; 9·5 km/6 mi across; area 52 km²/20 sq mi; 604 m/1982 ft deep; altitude 1879 m/6165 ft; in a large pit formed by the destruction of the summit of a prehistoric volcano.
A crater lake is a lake that forms in volcanic calderas or craters after the volcano has been inactive for some time. Some crater lakes are acidic, however, some lakes' water remains fresh.
A well-known crater lake, which bears the same name as the geological feature, is Crater Lake of Crater Lake National Park, in Oregon, USA. Crater Lake is the deepest lake in the United States with a depth of 594 m (1949 feet).
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