Jisho

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Noun
1. crater lake; volcanic lakeSee also 火口湖
Wikipedia definition
2. Crater lakeA crater lake is a lake that forms in a volcanic crater or caldera, such as a maar; less commonly and with lower association to the term a lake may form in an impact crater caused by a meteorite, or in an artificial explosion caused by humans. Sometimes lakes which form inside calderas are called caldera lakes, but often this distinction is not made.
Read “Crater lake” on English Wikipedia
Read “火山湖” on Japanese Wikipedia
Read “Crater lake” on DBpedia

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