Gorky Reservoir (Russian: Го́рьковское водохрани́лище) is an artificial lake in the central part of the Volga River formed by a hydroelectric dam of Gorky Hydroelectric Station (now called Nizhny Novgorod Hydroelectric Station) built in 1955 between the towns of Gorodets and Zavolzhye and filled in 1955 – 1957. It spans for 430 km from the dam of Rybinsk to the dam of Gorodets through Yaroslavl, Kostroma, Ivanovo and Nizhny Novgorod oblasts of Russia.