Cheboksary Reservoir is an artificial lake in the central part of the Volga River formed by the Cheboksary Dam in Novocheboksarsk.

The surface area of Cheboksary Reservoir is , max width is , max depth is . The reservoir has partly flooded the Mari Depression.Марийская низменность, Great Soviet Encyclopedia in 30 vols. / Ch. ed. A.M. Prokhorov . - 3rd ed. - M, 1969-1978.

The largest cities on the Reservoir are Nizhny Novgorod, Cheboksary and Kozmodemyansk.

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