river in Russia, tributary of Volga
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The Oka is a river in Russia that flows into the Volga River as one of its tributaries. It matters as an important waterway in Russia's river system and has historically played a role in the region's transportation and geography.
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Article
The Oka ( UK: /ˈɒkə/, US: /ˈoʊkə/; Russian: Ока IPA: [ɐˈka]) is a river in central Russia, the largest right tributary of the Volga. It flows through the regions of Oryol, Tula, Kaluga, Moscow, Ryazan, Vladimir and Nizhny Novgorod and is navigable over a large part of its total length, as far upstream as the town of Kaluga. Its length is 1,500 km (930 mi) and its catchment area 245,000 km (95,000 sq mi). The Russian capital Moscow sits on one of the Oka's tributaries—the Moskva, from which the capital's name is thought to be derived.
Name and history