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Oka (Roushie: Ока́, IPA: [ɐˈka]) is a river in central Roushie, the lairgest richt tributary o the Volga. It flows throu the regions o Oryol, Tula, Kaluga, Moscow, Ryazan, Vladimir, an Nizhny Novgorod.

Oka River
KintraRoushie
Basin
River moothVolga River
Physical characteristics
Lenth1,500 km (930 mi)

Coordinates: 56°20′N 43°59′E / 56.333°N 43.983°E / 56.333; 43.983