noun
dammed lake (natural damming)
Refers to a lake formed when a river is blocked by a natural dam, typically from a landslide, volcanic eruption, or lava flow.
堰止湖は、地滑りや火山活動によって川がせき止められてできる湖です。
A dammed lake is a lake formed when a river is blocked by a landslide or volcanic activity.
Compound of 堰き止め (sekidome, 'damming') + 湖 (ko, 'lake'). The spelling 堰止湖 is a common abbreviation of 堰き止め湖.