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Oka River
river, Russia
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Oka RiverOka River at Nizhny Novgorod, Russia.
Oka River,river in westernRussia. It is the largest right-bank tributary of theVolga. Rising in theCentral Russian Upland, it flows 932 miles (1,500 km), first north in a rather narrow, winding valley toKaluga, then sharply eastward across a broad lowland to join the Volga atNizhny Novgorod. The area of itsdrainage basin is 94,600 square miles (245,000 square km). Freeze-up lasts from early December to late March or early May.
The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated byAmy Tikkanen.