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Oka | |
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![]() The Oka riverbank in Nizhny Novgorod | |
![]() Map of the Volga watershed with the Oka highlighted | |
Native name | Ока (Russian) |
Location | |
Country | Russia |
Cities | Oryol, Kaluga, Serpukhov, Kolomna, Ryazan, Murom, Dzerzhinsk, Nizhny Novgorod |
Physical characteristics | |
Source | |
• location | Oryol Oblast |
• coordinates | 52°21′45″N 36°13′20″E / 52.36250°N 36.22222°E |
• elevation | 226 m (741 ft) |
Mouth | Volga |
• location | Nizhny Novgorod |
• coordinates | 56°19′55″N 43°58′53″E / 56.33194°N 43.98139°E |
• elevation | 67 m (220 ft) |
Length | 1,500 km (930 mi) |
Basin size | 245,000 km2 (95,000 sq mi) 244,308.3 km2 (94,328.0 sq mi)[1] |
Discharge | |
• location | Nizhny Novgorod (near mouth) |
• average | 1,260 m3/s (44,000 cu ft/s) 1,327.15 m3/s (46,868 cu ft/s)[2] |
Discharge | |
• location | Ryazan (Basin size: 97,995.8 km2 (37,836.4 sq mi) |
• average | 585.477 m3/s (20,675.9 cu ft/s)[3] |
Discharge | |
• location | Kaluga (Basin size: 54,877.8 km2 (21,188.4 sq mi) |
• average | 305.042 m3/s (10,772.5 cu ft/s)[4] |
Basin features | |
Progression | Volga→ Caspian Sea |
Tributaries | |
• left | Moskva, Klyazma |
• right | Moksha |
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The Oka (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 km2 (95,000 sq mi).[5] The Russian capital Moscow sits on one of the Oka's tributaries—the Moskva.