Oka (river)
| Oka | |
|---|---|
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) |
| 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) |
| 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) |
| 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) |
| Basin features | |
| Progression | Volga→ Caspian Sea |
| Tributaries | |
| • left | Moskva, Klyazma |
| • right | Moksha |
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 km2 (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.