Lopasnya

Water type: River
Basin: Oka -> Volga -> Caspian Sea -> Planet Earth
Continent: Europe
Climate: Continental
Country: Russia

The Lopasnya (Russian: Лопа́сня) is a river in Moscow Oblast in Russia. It is a left tributary of the Oka. It is 108 km in length, with a drainage basin of 1090 km². Its average discharge is 6,76 m³/s.