OKA

The Oka 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 and its catchment area 245,000 km². The Russian capital Moscow sits o…
The Oka 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 and its catchment area 245,000 km². The Russian capital Moscow sits on one of the Oka's tributaries—the Moskva.
  • Country: Russia
  • Cities: Oryol, Kaluga, Serpukhov, Kolomna, Ryazan, Murom, Dzerzhinsk, Nizhny Novgorod
  • Mouth: Volga
  • Length: 1,500 km (930 mi)
  • Basin size: 245,000 km² (95,000 sq mi) 244,308.3 km² (94,328.0 sq mi)
  • Progression: Volga→ Caspian Sea
Data from: en.wikipedia.org