The Volga (, ) is the longest river in Europe and the longest endorheic basin river in the world. Situated in Russia, it flows through Central Russia to Southern Russia and into the Caspian Sea. The Volga has a length of , and a catchment area of .«Река Волга» , Russian State Water Registry It is also Europe's largest river in terms of average discharge at delta – between per second – and of drainage basin. It is widely regarded as the national river of Russia. The hypothetical old Russian state, the Rus' Khaganate, arose along the Volga . Historically, the river served as an important meeting place of various Eurasian civilizations.

The river flows in Russia through forests, forest steppes and steppes. Five of the ten largest cities of Russia, including the nation's capital, Moscow, are located in the Volga's drainage basin. Because the Volga drains into the Caspian Sea, which is an endorheic body of water, the Volga does not naturally connect to any of the world's oceans.

Some of the largest reservoirs in the world are located along the Volga River. The river has a symbolic meaning in Russian culture – Russian literature and folklore often refer to it as Волга-матушка Volga-Matushka (Mother Volga).

Name The Russian hydronym () derives from Proto-Slavic *vòlga 'wetness, moisture', which is preserved in many Slavic languages, () 'moisture', Bulgarian () 'moisture', Czech 'dampness', Serbo-Croatian: () 'moisture', Slovene 'moisture', Polish 'moisture' and Macedonian () 'moisture', among others.See Max Vasmer's dictionary under "".

The Scythian name for the Volga was , literally meaning 'wetness'. This is related to the Avestan name for a mythical stream, (), which means "wet" or "moisture", and was derived from Proto-Indo-European or .J. P. Mallory & D. Q. Adams, Encyclopedia of Indo-European Culture, s.v. "dew" (London: Fitzroy Dearborn, 1997), 158–9. This name can be compared to several Indo-Iranic terms, such as: Sogdian () 'vein, blood vessel' (from Old Iranian ),Michiel de Vaan, Etymological Dictionary of Latin and the Other Italian Languages, s.v. "rōs, rōris" (Leiden: Brill, 2008), 526–7. Persian 'vein,'Nourai, Ali. 2013. An Etymological Dictionary of Persian, English and Other Indo-European Languages. Index of Words in Different Languages, vol. 1, p. 130. Vedic Sanskrit () 'dew, liquid, juice; mythical river'), which was also the name of a tributary of the Indus river.Lebedynsky, Iaroslav. Les Sarmates: Amazones et lanciers cuirassés entre Oural et Danube. Paris: Editions Errance, 2002. The Scythian name survives in modern Moksha as ().

The Greek author Herodotus recorded two more ancient Iranic names of the Volga: (; ), which was derived from Scythian , meaning "broad". The Huns' name of the Dnieper river, , was also derived from Scythian . (; )

The Turkic peoples living along the river formerly referred to it as or Atil. In modern Turkic languages, the Volga is known as () in Tatar, () in Chuvash, in Bashkir, in Kazakh, and in Turkish. The Turkic names go back to the ancient Turkic form "/", the origin and meaning of which are not clear. Perhaps this form has a connection with the hydronym Irtesh.Akhmetyanov R. G. Brief Historical and etymological dictionary of the Tatar language. - Kazan: Tat. publishing house, 2001. p. 76. (In tatar: Әхмәтьянов Р. Г. Татар теленең кыскача тарихи-этимологик сүзлеге. — Казан: Тат. кит. нәшр., 2001. б. 76. )

The Turkic peoples associated the Itil's origin with the Kama. Thus, a left tributary to the Kama was named the ('White Itil'), which is joined by the ('Black Itil') at Ufa. The name () is used in the Cherkess language.

In Asia the river was known by its other Turkic name 'yellow water', but the Oirats also used their own name, or 'adaptation river'. Presently the Mari, another Uralic group, call the river (), meaning 'way' in Tatar.

Description

The Volga is the longest river in Europe, and its catchment area is almost entirely inside Russia, though the longest river in Russia is the Ob–Irtysh river system. It belongs to the closed basin of the Caspian Sea, being the longest river to flow into a closed basin. The source of the Volga lies in the village of Volgoverkhov'e in Tver Oblast. Rising in the Valdai Hills above sea level northwest of Moscow and about southeast of Saint Petersburg, the Volga heads east past Lake Sterzh, Tver, Dubna, Rybinsk, Yaroslavl, Nizhny Novgorod, and Kazan. From there it turns south, flows past Ulyanovsk, Tolyatti, Samara, Saratov and Volgograd, and discharges into the Caspian Sea below Astrakhan at below sea level.

The Volga has many tributaries, most importantly the Kama, the Oka, the Vetluga, and the Sura. The Volga and its tributaries form the Volga river system, which flows through an area of about in the most heavily populated part of Russia. The Volga Delta has a length of about and includes as many as 500 channels and smaller rivers. The largest estuary in Europe, it is the only place in Russia where pelicans, flamingos, and lotuses may be found. The Volga freezes for most of its length for three months each year.

The Volga drains most of Western Russia. Its many large reservoirs provide irrigation and hydroelectric power. The Moscow Canal, the Volga–Don Canal, and the Volga–Baltic Waterway form navigable waterways connecting Moscow to the White Sea, the Baltic Sea, the Caspian Sea, the Sea of Azov and the Black Sea. High levels of chemical pollution have adversely affected the river and its habitats.

The fertile river valley provides large quantities of wheat and other agricultural produce, and also has many mineral riches. A substantial petroleum industry centers on the Volga valley. Other resources include natural gas, salt, and potash. The Volga Delta and the Caspian Sea are fishing grounds.

The Volga River basin serves as a major invasion corridor for aquatic species. Recent studies indicate that the proportion of alien fish species in the total catch varies significantly across the basin, reaching 36–47% in the Saratov and Kuibyshev reservoirs. A bidirectional, asymmetric expansion is observed: "southern" Ponto-Caspian and Azov-Black Sea species are actively moving northward into the reservoir cascade, while "northern" species (such as vendace and European smelt) are experiencing range regression, likely due to climate warming and rising water temperatures.

Confluences (downstream to upstream)

Akhtuba (near Volzhsky), a distributary Bolshoy Irgiz (near Volsk) Samara (in Samara) Kama (south of Kazan) Kazanka (in Kazan) Sviyaga (west of Kazan) Vetluga (near Kozmodemyansk) Sura (in Vasilsursk) Kerzhenets (near Lyskovo) Oka (in Nizhny Novgorod) Uzola (near Balakhna) Unzha (near Yuryevets) Kostroma (in Kostroma) Kotorosl (in Yaroslavl) Sheksna (in Cherepovets) Mologa (near Vesyegonsk) Kashinka (near Kalyazin) Nerl (near Kalyazin) Medveditsa (near Kimry) Dubna (in Dubna) Shosha (near Konakovo) Tvertsa (in Tver) Vazuza (in Zubtsov) Selizharovka (in Selizharovo)

Reservoirs (downstream to upstream) A number of large hydroelectric reservoirs were constructed on the Volga during the Soviet era. They are: Volgograd Reservoir Saratov Reservoir Kuybyshev Reservoir the largest in Europe by surface Cheboksary Reservoir Gorky Reservoir Rybinsk Reservoir Uglich Reservoir Ivankovo Reservoir

Biggest cities on the shores of the Volga Kazan Nizhny Novgorod Samara Volgograd Saratov Tolyatti Yaroslavl Astrakhan Ulyanovsk Cheboksary Tver

Bridges across the Volga Kostroma rail bridge

Human history

The Volga–Oka region has been occupied for at least 9,000 years and supported a bone and antler industry for producing bone arrowheads, spearheads, lanceheads, daggers, hunters knives, and awls. The makers also used local quartz and imported flints.Zhilin, M. (2015). Early Mesolithic bone arrowheads from the Volga-Oka interfluve, central Russia. 32. 35-54.

During classical antiquity, the Volga formed the boundary between the territories of the Cimmerians in the Caucasian Steppe and the Scythians in the Caspian Steppe. After the Scythians migrated to the west and displaced the Cimmerians, the Volga became the boundary between the territories of the Scythians in the Pontic and Caspian Steppes and the Massagetae in the Caspian and Transcaspian steppes.

Between the 6th and the 8th centuries, the Alans settled in the Middle Volga region and in the steppes of Russia's southern region in the Pontic–Caspian steppe.

The area around the Volga was inhabited by the Slavic tribes of Vyatichs and Buzhans, by Finno-Ugric, Scandinavian, Baltic, Hunnic and Turkic peoples (Tatars, Kipchaks, Khazars) in the first millennium AD, replacing the Scythians. Furthermore, the river played a vital role in the commerce of the Byzantine people. The ancient scholar Ptolemy of Alexandria mentions the lower Volga in his Geography (Book 5, Chapter 8, 2nd Map of Asia). He calls it the Rha, which was the Scythian name for the river. Ptolemy believed the Don and the Volga shared the same upper branch, which flowed from the Hyperborean Mountains. Between 2nd and 5th centuries Baltic people were very widespread in today's European Russia. Baltic people were widespread from Sozh River till today's Moscow and covered much of today's Central Russia and intermingled with the East Slavs. The Russian ethnicity in Western Russia and around the Volga river evolved to a very large extent, next to other tribes, out of the East Slavic tribe of the Buzhans and Vyatichis. The Vyatichis were originally concentrated on the Oka River. Furthermore, several localities in Russia are connected to the Slavic Buzhan tribe, like for example Sredniy Buzhan in the Orenburg Oblast, Buzan and the Buzan River in the Astrakhan Oblast. Buzhan (; also known as Būzān) is also a village in Nishapur, Iran. In late 8th century the Russian state Russkiy Kaganate is recorded in different Northern and Oriental sources. The Volga was one of the main rivers of the Rus' Khaganates culture.

Subsequently, the river basin played an important role in the movements of peoples from Asia to Europe. A powerful polity of Volga Bulgaria once flourished where the Kama joins the Volga, while Khazaria controlled the lower stretches of the river. Such Volga cities as Atil, Saqsin, or Sarai were among the largest in the medieval world. The river served as an important trade route connecting Scandinavia, Finnic areas with the various Slavic tribes and Turkic, Germanic, Finnic and other people in Old Rus', and Volga Bulgaria with Khazaria, Persia and the Arab world.

Khazars were replaced by Kipchaks, Kimeks and Mongols, who founded the Golden Horde in the lower reaches of the Volga. Later their empire divided into the Khanate of Kazan and Khanate of Astrakhan, both of which were conquered by the Russians in the course of the 16th century Russo-Kazan Wars. The Russian people's deep feeling for the Volga echoes in national culture and literature, starting from the 12th century Lay of Igor's Campaign. The Volga Boatman's Song is one of many songs devoted to the national river of Russia.