Oka is a great river in Russia, right confluent of Volga. It flows through the Oblasts of Oryol, Tula, Kaluga, Moscow, Ryazan, Vladimir and Nizhny Novgorod.

Length 1500 km.

Cities and towns on Oka

• Orel
• Kaluga
• Serpukhov
• Pushchino
• Kolomna
• Ryazan
• Murom
• Dzerzhinsk
• Nizhny Novgorod