Oka River (Siberia)

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Oka
Origin Sayan Mountains
Mouth Angara River
Basin countries Russia
Length 630 km (391 mi)

The Oka (Russian: Ока) 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.