The Oka (, ) is a

river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...

Siberia Siberia ( ; , ) is an extensive geographical region comprising all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has formed a part of the sovereign territory of Russia and its predecessor states ...

, left

tributary A tributary, or an ''affluent'', is a stream or river that flows into a larger stream (''main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which they ...

of the

Angara The Angara (; ) or Angar ( мүрэн) is a major river in Siberia, which traces a course through Russia's Irkutsk Oblast and Krasnoyarsk Krai. It drains out of Lake Baikal and is the headwater tributary of the Yenisey. It is long, and has ...

. It is long, and has a

drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, ...

of .

Course

It originates in the Oka Lake,

Oka Plateau Oka or OKA may refer to: * "Officially known as", used to introduce an official name Vehicles * Oka (automobile), a small car designed by AvtoVAZ and produced by ZMA and SeAZ * OKA (truck), a large 4-wheel-drive vehicle made in Western Australi ...

Sayan Mountains The Sayan Mountains (, ; ) are a mountain range in southern Siberia spanning southeastern Russia (Buryatia, Irkutsk Oblast, Krasnoyarsk Krai, Tuva and Khakassia) and northern Mongolia. Before the rapid expansion of the Tsardom of Russia, the mou ...

at the western end of

Buryatia Buryatia, officially the Republic of Buryatia, is a republic of Russia located in the Russian Far East. Formerly part of the Siberian Federal District, it has been administered as part of the Far Eastern Federal District since 2018. To its nort ...

. It flows roughly northwestwards with the

Bolshoy Sayan Bolshoi (, meaning ''big'', ''large'', ''great'', ''grand'', etc.) may refer to: *Bolshoi Theatre, a ballet and opera theatre in Moscow, Russia **Bolshoi Ballet The Bolshoi Ballet is an internationally renowned classical ballet company based at ...

to the southwest. After it bends northeastwards the river flows between the Kropotkin Range and the Belskye Goltsy (Бельские Гольцы). After the Khoyto-Oka tributary joins it from the left it enters

Irkutsk Oblast Irkutsk Oblast (; ) is a federal subjects of Russia, federal subject of Russia (an oblast), located in southeastern Siberia in the basins of the Angara River, Angara, Lena River, Lena, and Nizhnyaya Tunguska Rivers. The administrative center is ...

and flows in a roughly more northern direction. Finally the Oka discharges into the

Bratsk Bratsk (, ; ) is a Types of inhabited localities in Russia, city in Irkutsk Oblast, Russia, located on the Angara, Angara River near the vast Bratsk Reservoir. It had population of . Etymology The name of the city, which is from the same ro ...

reservoir A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of wa ...

Google Earth Google Earth is a web mapping, web and computer program created by Google that renders a 3D computer graphics, 3D representation of Earth based primarily on satellite imagery. The program maps the Earth by superimposition, superimposing satelli ...

Water of Russia - Ока
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References

Rivers of Irkutsk Oblast Rivers of Buryatia {{FarEast-Russia-river-stub

Course

See also

References