Rybinsk Reservoir
The district lies entirely in the drainage area of the Rybinsk Reservoir of the Volga River. The rivers in its western part drain into the Ostrechina and the Osen, right tributaries of the Mologa River. The northeastern part of the district belongs to the basin of the Sit River, a tributary of the Rybinsk Reservoir. The Sit itself has its source in the district, northwest of Sonkovo. The rivers in the southeastern part of the district drain into the Korozhechna, another tributary of the Rybinsk Reservoir. The Korozhechna crosses the southern part of the district from west to east.