|Chapayevka River, Mocha River|
|Main source||Siny Syrt, Samara Oblast, Russia|
|River mouth||Saratov Reservoir, Volga|
|Basin size||4,310 km2 (1,660 sq mi)|
|Length||298 km (185 mi)|
Chapayevka (Russian: Чапа́евка) or the Mocha (Мо́ча) is a river in Samara Oblast, Russia, a left tributary of the Volga River. It origins at the slope of Siny Syrt and flows to the Saratov Reservoir, near Novokuybyshevsk, Samara agglomeration. It is 298 km long. The town of Chapayevsk stays alongside the river. The river is navigable for 34 from its mouth. The river has snow feeding and dries up in the upper stream. Since November till April it is used to be frozen. Major inflows are Petrushka, Vetlyanka, Vyazovka.
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