地ち下か湖こ

noun

underground lake; subterranean lake

Refers to a lake located beneath the earth's surface, often in caves or caverns. Synonymous with 地底湖 (ちていこ).

See also: 地底湖

• その洞どう窟くつの奥おくには美うつくしい地ち下か湖こがあった。

  There was a beautiful underground lake deep inside the cave.