Oka
Volga
['Oder', 'Rio Grande', 'Ammonoosuc River', 'Ufa River', 'Kama River', 'River Tame', 'Pranahita River', 'Long Island Sound', 'Omo', 'Rio Negro', 'Yarra River', 'Drava', 'Santiam River', 'Saskatchewan River', 'Androscoggin River', 'Bighorn River', 'Champlain', 'River Severn', 'Muncy Creek', 'Albemarle Sound', 'Rhine River', 'Millstone River', 'Little Kanawha River', 'River Ure', 'Malheur River', 'Prut', 'Kasai River', 'Feather River', 'Ganga River', 'Isar', 'Lake Ontario', 'Xingu River', 'Passaic River', 'Awash', 'River Doe', 'Vltava River', 'East China Sea', 'Godavari', 'Chippewa River', 'Amur', 'Indus', 'Mediterranean Sea', 'Northern Dvina', 'Newark Bay', 'Hunter River', 'Red River', 'West Branch Susquehanna River', 'lorraine', 'Chenango River', 'Columbia River', 'Rappahannock River', 'South Platte River', 'Chari River', 'Allegheny River', 'Awash River', 'Squamish River', 'River Tawe', 'Smoky Hill River', 'Orontes', 'White Nile', 'Oka River', 'Mohawk River', 'Fraser River', 'Terek River', 'Kettle River', 'Bering Sea', 'Jordan River', 'Moselle River', 'North Platte', 'River Westbourne', 'Ussuri', 'San Pedro River', 'Ruhr River', 'Pacific', 'Thames', 'Ohio', 'Yellowstone River', 'Mahanoy Creek', 'Red Rock River', 'Lake Beloye', 'Irish Sea', 'Orontes River', 'Lake Superior', 'Congo', 'Sava', 'Heilongjiang', 'Tigris', 'Garonne', 'Lake Memphremagog', 'Drava River', 'Kolyma', 'Piscataqua River', 'river Ourthe', 'Amazon River', 'Fly River', 'Shashe River', 'Susquehanna River', 'Yakima River', 'Snake River']
Oka River
Oka (Russian: Ока́, [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 to the town of Kaluga. Its length exceeds 1,500 kilometres (930 mi). The Russian capital Moscow sits on one of the Oka's tributaries—the Moskva River.