Moscow is named after the Moskva River (Russian: Москва), and the most widely accepted explanation of the river’s name traces it to a Proto-Balto-Slavic root *mŭzg-/muzg-, itself from the Proto-Indo-European *meu- “wet”, so that Moskva would mean something like “the river at the marsh” or “the boggy river”. The derivation is not settled: a rival Finno-Ugric hypothesis links the name to the pre-Slavic Merya and Muroma peoples, who may have called the river Mustajoki, “Black River”. What nobody disputes is the order of events. The river carried the name first, the town on its bank took it, and the town, first recorded in a chronicle entry for 1147, grew into the capital of Russia, with 13,010,112 residents at the 2021 census.
Moskva: One Word for a River and a City
In Russian the city and the river share exactly the same word, Москва, Moskva. Context usually separates them, and when it does not, Russians call the river Moskva-reka (Река Москва), “the Moskva river”, keeping plain Moskva for the city. English never had that problem, because it borrowed the city’s name by a different route, through Latin, and ended up with Moscow for the capital and, in most English texts, Moskva for the river.
That shared word is the main evidence that the river came first. The river is far longer and older than the town: it runs for about 473 km (some sources give 502 km), and recent studies suggest its current bed was occupied about 12,000 years ago. A small stronghold on one bend of it naturally became “the place on the Moskva”.
*mŭzg- and the Marshes: the Accepted Balto-Slavic Derivation
The explanation that the Wikipedia articles on both Moscow and the river call the most linguistically well-grounded rests on a Proto-Balto-Slavic root *mŭzg-/muzg-, connected to the Proto-Indo-European *meu-, “wet”. On this reading, Moskva described a river running through wetland or marsh, a description that would suit the meadows and floodplains still found along stretches of its upper course.
The strength of the theory is that the same root can be followed into several related languages, each keeping a sense of water, washing or sinking:
- Russian музга (muzga), “pool, puddle”
- Lithuanian mazgoti and Latvian mazgāt, “to wash”
- Prekmurje Slovene müzga, “marsh, swamp”
- Sanskrit májjati, “to drown”
- Latin mergō, “to dip, immerse”
The family resemblance does not stop at common nouns. Moskov is a surname found in several Slavic countries, most often in Russia, Bulgaria, Ukraine and North Macedonia, and Poland has similarly formed place names such as Mozgawa.
The older idea, repeated on many websites, that the name means “cow ford” has no support in the cited scholarship and should be treated as a folk etymology. The same goes for a handful of explanations from Celtic, Iranian and Caucasian languages, which the river’s Wikipedia article describes as having little or no scientific ground and as now largely rejected by linguists.
Mustajoki and the Merya: the Finno-Ugric Alternative
Before the East Slavs arrived, the upper Volga basin was home to Finnic peoples. The Merya, placed by the Primary Chronicle around Lake Nero and Lake Pleshcheyevo, and the closely related Muroma lived along the rivers of what is now central Russia. Their territory was drawn into Kievan Rus’ in the 10th century, and they had been assimilated by Russians by the 17th century. Not a single word of the Merya language was ever written down, but many river names in the region are thought to be of Meryan origin.
That background gives the second theory its appeal. According to one Finno-Ugric hypothesis, the Merya and Muroma called the river Mustajoki, “Black River”, and the Slavic name is a reshaped form of that. That is the source of the “dark water” meaning that appears in many popular accounts of Moscow’s name.
The difficulty is that the Merya left no texts, so any Meryan form has to be reconstructed backwards from place names, which makes the argument partly circular. Archaeology does confirm that Finnic and Slavic peoples both lived on this river: the Wikipedia article on the Kremlin says the site was continuously inhabited by Meryans from the 2nd century BCE, and that the Slavic Vyatichi later built a fortified grad on the hill where the Neglinnaya River flowed into the Moskva. The two theories may be describing the same valley through the eyes of two different peoples; only the Balto-Slavic one currently has the stronger linguistic support.
From *Mosky in 1147 to Moskva, Moscow and Muscovy
The written history of the name begins with a single chronicle entry. Under the year 1147 the chronicles record that Yuri Dolgorukiy, prince of Rostov-Suzdal, met Sviatoslav Olgovich, then prince of Belgorod Kievsky, at a place called Moscow. At the time it was a minor town on the western edge of Yuri’s principality. Nine years later, in 1156, Yuri fortified it with wooden walls and a moat, which is why he is often called the founder of Moscow, although the settlement may well be older than his visit.
The form of the name in that entry is not the one used today. Historical linguists reconstruct the Old Russian name as *Москы, *Mosky, one of a small group of Slavic nouns with a ū-stem ending. Those nouns were being reshaped early in the language’s history, so the 12th-century sources show it in different grammatical cases: Московь, Moskovĭ (accusative), Москви, Moskvi (locative), and Москвe/Москвѣ, Moskve/Moskvě (genitive). The 1147 mention is in the locative, na Moskvě, “at Moscow”. From the genitive forms Russian built a new regular noun, Москва, Moskva, which first appears in the 14th century.
Western European languages, however, took their form from the older accusative Moskovĭ, by way of post-classical Latin Moscovia or Muscovia. That is why the city has a -ow, -au or -ou ending in so many languages:
- English: Moscow
- German: Moskau
- French: Moscou
- Portuguese: Moscou or Moscovo
- Spanish: Moscú
The same Latin source produced Muscovy. From the 16th century, under Polish–Lithuanian influence, Western Europe often called the whole Russian state Muscovy, and that usage lasted until the early 18th century. It also left English with the demonym Muscovite for a resident of the city. Over the centuries Moscow picked up other names too: the epithet “Third Rome”, and in Soviet times the title of one of 12 honorary Hero Cities.
The Moskva River Today: About 473 km from Smolensk Oblast to Kolomna
The river that gave the city its name rises about 140 km west of Moscow and flows roughly east through Smolensk and Moscow oblasts. It passes the towns of Mozhaysk and Zvenigorod before reaching the capital, then continues south-east past Zhukovsky, Bronnitsy and Voskresensk. About 110 km south-east of Moscow, at the city of Kolomna, it joins the Oka, a tributary of the Volga, whose water finally ends in the Caspian Sea.
It is a modest river by Russian standards. Its drainage basin covers about 17,600 km², it falls about 155 m over its course, and it is no more than 3 m deep above Moscow and up to 6 m below the city. Inside Moscow it is 120 to 200 m wide, narrowest under the Kremlin walls. Average discharge rises from about 38 m³/s near Zvenigorod to about 250 m³/s where it meets the Oka.
The modern river is also partly a Volga river. Since the Moscow Canal was dug between 1932 and 1937, connecting the Moskva at Tushino with the Volga at Dubna over 128.1 km, a share of upper Volga water has flowed into it. That made reliable commercial shipping possible; earlier dams, built in 1785, 1836 and 1878, had not been enough to stop summer droughts from halting traffic. The canal was built largely by Gulag prisoners, a history covered in our article on the Moscow Canal. Today drinking water for the capital is drawn from five stations on the Moskva and from upper Volga reservoirs.
Borovitsky Hill and the Neglinnaya: Where the Name Took Root
The exact spot where a river name became a city name is still visible. The Moscow Kremlin stands on Borovitsky Hill, at the point where the small Neglinnaya River once flowed into the Moskva. Slavs occupied the south-western part of the hill by the 11th century, a date supported by a metropolitan’s seal from the 1090s found there by Soviet archaeologists. The Kremlin used the Neglinnaya as a moat, and until the 14th century the fortress was simply called the “grad of Moscow”; the word Kremlin is first recorded in 1331.
The rivers shaped the town’s growth. The Neglinnaya moat slowed building to the west of the Kremlin, so the city first spread east into what became Red Square and Kitay-gorod, and even after Muscovites settled the western side, frequent flooding kept the land along the Neglinnaya empty. Its eastern limit was another tributary, the Yauza, mentioned in chronicles from 1156 and the Moskva’s largest tributary inside the city; Moscow only grew across it in the early 16th century. The Neglinnaya was later put underground and now runs for 7.5 km through tunnels beneath Tsvetnoy Boulevard and the Alexander Garden, emptying into the Moskva near the Bolshoy Kamenny and Bolshoy Moskvoretsky bridges.
The Kremlin itself was rebuilt several times on that riverside hill: an oak fortress under Ivan I Kalita in 1339, white limestone walls under Dmitri Donskoi in 1366–1368, and the present walls, about 2,235 m long, built by Italian masters between 1485 and 1495. Its full story is told in our guide to the Moscow Kremlin.
Moscow on the Moskva in 2021: a City Still Defined by Its River
Almost nine centuries after that 1147 chronicle entry, the river and the city remain tied together. Moscow covers 2,511 km² within its city limits, and its population rose from 11,503,501 in the 2010 census to 13,010,112 in 2021, making it the most populous city entirely in Europe. As of 2007 there were 49 bridges across the Moskva and its canals within city limits, starting with the Bolshoy Kamenny Bridge, the first stone crossing, put up in 1692. Canal building has also cut new islands out of the river, among them Serebryany Bor and the strip opposite the Kremlin that Muscovites informally call Bolotny Ostrov, “Bog Island”, a name that fits neatly with the marshy meaning most linguists see in the word Moskva.
The river can still assert itself. Its historical high-water mark in central Moscow, 127.25 m above sea level, was set by the flood of 1908, against a long-term average summer level of about 120 m.
Moscow is far from the only capital whose name hides a geographical description that later speakers forgot. For a city whose name is argued over just as hard, see how scholars explain the origin of the name Paris, or read about the modern city itself in our guide to Moscow, capital of Russia.