Oka River (Siberia)

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Country Russia
Basin features
Main source Sayan Mountains
River mouth Angara River
Physical characteristics
Length 630 km (390 mi)

The Oka (Russian: Ока, Buryat: Аха) is a river in Siberia, left tributary of the Angara River. It originates in the Sayan Mountains in western Buryatia and flows through Irkutsk Oblast. It flows for 630 km (391 mi), into the Bratsk reservoir.

Coordinates: 55°30′55″N 102°20′54″E / 55.51528°N 102.34833°E / 55.51528; 102.34833