endorheic lake; closed lake
A lake with no outlet to the sea; water leaves only by evaporation or seepage. Technical term in geography, contrasted with 有口湖 (exorheic lake).
See also: 有口湖
The Caspian Sea is the world's largest endorheic lake.
An endorheic lake is a lake that has no outflowing rivers.
Compound of 無 (mu, 'without') + 口 (kō, 'mouth' or 'outlet') + 湖 (ko, 'lake'), literally 'lake without an outlet'. The reading むこうこ follows standard on'yomi.