Rybinsk Reservoir ([Рыбинское водохранилище]), informally called the Rybinsk Sea, is a water reservoir on the Volga River and its tributaries the Sheksna and Mologa, formed by Rybinsk Hydroelectric Station dam, located in the Tver, Vologda, and Yaroslavl Oblasts. At the time of its construction, it was the largest man-made body of water on Earth. It is the northernmost point of the Volga. The Volga–Baltic Waterway starts from there. The principal ports are Cherepovets in Vologda Oblast and Vesyegonsk in Tver Oblast.
Surface area 4,580 km2
Average depth 5.6 m
