noun
crater lake; volcanic lake
A lake formed in a volcanic crater or caldera. Often used in geography and travel contexts.
See also: 火口湖
蔵王の火山湖はエメラルドグリーンで有名だ。
The volcanic lake at Zao is famous for its emerald green color.
この地域にはいくつかの火山湖が点在している。
Several crater lakes are scattered around this area.