Kuybyshev Reservoir

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Kuybyshev Reservoir or Kuybyshevskoye Reservoir (Russian: Ку́йбышевское водохрани́лище, Kuybyshevskoye Vodokhranilishche, Tatar Cyrillic: Куйбышев сусаклагычы, Latin: Kuybışev susaqlağıçı), sometimes called Samara Reservoir and informally called Kuybyshev Sea, is a reservoir of the middle Volga and lower Kama in the Chuvash Republic, Mari El Republic, Republic of Tatarstan, Samara Oblast and Ulyanovsk Oblast, Russia. The Kuybyshev Reservoir has a surface area of 6,450 km² and a volume of 58 billion cubic meters, and is the largest reservoir in Europe and the third in the world by surface area. The major cities of Kazan, Ulyanovsk, and Tolyatti are adjacent to the reservoir.

The reservoir is created by the dam of Zhiguli Hydroelectric Station (formerly, V.I. Lenin Volga Hydroelectric Station), located between the cities of Zhigulevsk and Togliatti in Samara Oblast. It was filled in 1955–1957.