Cheboksary Reservoir (Russian: Чебоксарское водохранилище, Chuvash: Шупашкар шыв усравĕ) is an artificial lake in the central part of the Volga River and formed by the Cheboksary Dam in Novocheboksarsk.
A surface area of Cheboksary Reservoir is 2190 km², max width is 16 km, max depth is 35 m.
The largest cities on the Reservoir are Nizhny Novgorod, Cheboksary and Kozmodemyansk.
Coordinates: 56°18′00″N 46°42′53″E / 56.30000°N 46.71472°E