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The Or (, ) is a river in
Orenburg Oblast Orenburg Oblast (also Orenburzhye) is a federal subject of Russia (an oblast), mainly located in Eastern Europe. Its administrative center is the city of Orenburg. From 1938 to 1957, it bore the name Chkalov Oblast in honor of Valery Chkal ...
of
Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...
and Aktobe Province of
Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a landlocked country primarily in Central Asia, with a European Kazakhstan, small portion in Eastern Europe. It borders Russia to the Kazakhstan–Russia border, north and west, China to th ...
. It is a 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 Ural, and is 332 km long, with 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 18 600 km2. The river is formed by the confluence of the rivers Shiyli and Terisbutak, which have their sources on the western slopes of the
Mugodzhar Hills Mugalzhar (), also known as Mugodzhar Hills or Mugodzhar Range (),
Geonames is a mountain range of moderate height in the Akt ...
, and it joins the Ural by the city of
Orsk Orsk () is the second largest city in Orenburg Oblast, Russia, located on the steppe about southeast of the southern tip of the Ural Mountains. The city straddles the Ural River. Population: It lies adjacent to the Kazakhstan–Russia border. ...
. Most of its discharge are from melting snow. The average discharge, 61 km from its mouth, is 21.3 m3/sek. The spring flooding lasts from April to mid-May. The rest of the year the waterlevel is very low. The river freezes in late October and is icebound until March – April. The river is used for irrigation and water supply.


References

Rivers of Orenburg Oblast Rivers of Kazakhstan International rivers of Asia Ural basin {{South-Russia-river-stub