Nizhny Novgorod Oblast in the context of "Oka River"

Nizhny Novgorod (/ˌnɪʒni ˈnɒvɡərɒd/ NIZH-nee NOV-gə-rod; Russian: Нижний Новгород, IPA: [ˈnʲiʐnʲɪj ˈnovɡərət] , lit. 'Lower Newtown') is both a city and 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, and roughly 1.7 million residents in the wider urban area. Nizhny Novgorod is the sixth-largest city in Russia, and the second-most populous city on the Volga and Volga Federal District. The city is located 420 kilometers (260 mi) east of Moscow. It is an important economic, architectural, educational and cultural centre in Russia and the Volga-Vyatka Economic Region, and provides the majority of Russia's river tourism.

The city was founded on 4 February 1221 by Prince George II of Vladimir. In 1612, Kuzma Minin and Prince Dmitry Pozharsky organized an army for the liberation of Moscow from the Poles and Lithuanians. In 1817, Nizhny Novgorod became a great trade centre of the Russian Empire. In 1896, at the trade centre, an All-Russia Exhibition was organized. During the Soviet period, the city turned into an important industrial centre, and was known as Gorky. In particular, the Gorky Automobile Plant was constructed in this period. Around this time, the city was given the nickname "Russian Detroit". Shortly before the dissolution of the Soviet Union the city was renamed Nizhny Novgorod once again. In 1985, the Nizhny Novgorod Metro was opened. In 2016, Vladimir Putin opened the new 70th Anniversary of Victory Plant, which is part of the Almaz-Antey Air and Space Defence Corporation.

Mari El, officially the Mari El Republic, is a republic of Russia. It is in the European region of the country, along the northern bank of the Volga River, and administratively part of the Volga Federal District. The republic has a population of 696,459 (2010 Census). Yoshkar-Ola is the capital and largest city.

Mari El, one of Russia's ethnic republics, was established for the indigenous Mari people, a Finno-Ugric nation who have traditionally lived along the Volga and Kama Rivers. The majority of the republic's population are ethnic Russians (52.5%), with a significant Mari minority (40.1%), and smaller minority populations of Tatars and Chuvash. The official languages are Russian and Mari. Mari El is bordered by Nizhny Novgorod Oblast to the west, Kirov Oblast to the north, Tatarstan to the east, and Chuvashia to the south.

The Erzya language (эрзянь кель, eŕźań keĺ, pronounced [ˈerʲzʲanʲ ˈkʲelʲ]), also Erzian or historically Arisa, is spoken by approximately 300,000 people in the northern, eastern and north-western parts of the Republic of Mordovia and adjacent regions of Nizhny Novgorod, Chuvashia, Penza, Samara, Saratov, Orenburg, Ulyanovsk, Tatarstan and Bashkortostan in Russia. A diaspora can also be found in Armenia and Estonia, as well as in Kazakhstan and other states of Central Asia. Erzya is currently written using Cyrillic with no modifications to the variant used by the Russian language. In Mordovia, Erzya is co-official with Moksha and Russian.

The language belongs to the Mordvinic branch of the Uralic languages. Erzya is a language that is closely related to Moksha but has distinct phonetics, morphology and vocabulary.

Sarov (Russian: Саро́в) is a closed town in Nizhny Novgorod Oblast, Russia. It was known as Gorkiy-130 (Горький-130) and Arzamas-16 (Арзама́с-16), after a (somewhat) nearby town of Arzamas, from 1946 to 1991. Until 1995, it was known as Kremlyov/Kremlev/Kremljov (Кремлёв). The town is closed because it is the Russian center for nuclear research. Population: 92,047 (2010 Census); 87,652 (2002 Census)

Gorodets (Russian: Городе́ц) is a town and the administrative center of Gorodetsky District in Nizhny Novgorod Oblast, Russia, located on the left bank of the Volga River, 53 kilometers (33 mi) northwest of Nizhny Novgorod, the administrative center of the oblast. Population: 30,658 (2010 census); 32,442 (2002 census); 34,210 (1989 Soviet census); 34,000 (1970).