The Oka (, ) 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.
Oka River 例句
英汉例句
A city of west-central Russia on the Oka River west of Kazan. It is a chemical manufacturing and industrial center. Population, 272,000.