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Oka River

River in Russia
The Oka is a river in central Russia, the largest right tributary of the Volga. It flows through the regions of Oryol, Tula, Kaluga, Moscow, Ryazan, Vladimir and Nizhny Novgorod and is navigable over a large part of its total length, as far... Wikipedia
Cities: Serpukhov, Tarusa, Ryazan, and more
Length: 932.1 mi
Basin area: 94,595 mi²