Nizhny Novgorod is the administrative centre of Nizhny Novgorod Oblast and the Volga Federal District in Russia. The city is located at the confluence of the Oka and the Volga rivers in Central Russia, with a population of over 1.2 million residents, up to roughly 1.7 million residents in the urban agglomeration. Nizhny Novgorod is the sixth-largest city in Russia, the second-most populous city on the Volga, as well as the Volga Federal District. It is an important economic, transportation, scientific, educational and cultural center in Russia and the vast Volga-Vyatka economic region, and is the main center of river tourism in Russia. In the historic part of the city there are many universities, theaters, museums and churches.

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 (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.