Sakha, also known as Yakutia or Yakutiya, is a republic of Russia. It is situated in the Russian Far East, along the Arctic Ocean, with a population of roughly 1 million. Sakha comprises half of the area of its governing Far Eastern Federal District, and is the world's largest country subdivision, covering over 3,083,523 square kilometers (1,190,555 sq mi). Yakutsk, which is the world's coldest large city, is its capital and largest city. The republic has a reputation for an extreme and severe climate, with the lowest temperatures in the Northern Hemisphere being recorded in Verkhoyansk and Oymyakon, and regular winter averages commonly dipping below −35 °C (−31 °F) in Yakutsk. The hypercontinental tendencies also result in warm summers for much of the republic.
The Don is the fifth-longest river in Europe. Flowing from Central Russia to the Sea of Azov in Southern Russia, it is one of Russia's largest rivers and played an important role for traders from the Byzantine Empire.
The Oka is a river in central Russia, the largest right tributary of the Volga. It flows through the regions of Oryol, Tula, Kaluga, Moscow, Ryazan, Vladimir and Nizhny Novgorod and is navigable over a large part of its total length, as far upstream as to the town of Kaluga. Its length is 1,500 km (930 mi) and its catchment area is 245,000 km2 (95,000 sq mi). The Russian capital Moscow sits on one of the Oka's tributaries—the Moskva.
The Tobol is a river in Western Siberia and the main (left) tributary of the Irtysh. Its length is 1,591 km (989 mi), and the area of its drainage basin is 426,000 km2 (164,000 sq mi).
Oryol Oblast, also known as Orlovshchina is a federal subject of Russia. Its administrative center is the city of Oryol. Population: 724,686.
The Desna is a river in Russia and Ukraine, a major left-tributary of the Dnieper. Its name means "right hand" in the Old East Slavic language. It has a length of 1,130 km (702 mi), and its drainage basin covers 88,900 km2 (34,324 sq mi).
The Angrapa is a river that begins in northeastern Poland and ends in the Kaliningrad Oblast of Russia. Originating in Lake Mamry, it joins the 101-km-long Instruch at a point near Chernyakhovsk – variously assessed as lying 140, 169, or 172 km from its source – to form the Pregolya. Its largest tributaries are the 89-km-long Gołdapa, which joins just before the border, and the Pissa.
The Uzola, also spelled as Usola is a river in Nizhny Novgorod Oblast in Russia. It is a left tributary of the Volga. The length of the river is 147 km (91 mi). The area of its basin is 1,920 km2 (740 sq mi). The Uzola freezes up in November and stays under the ice until April.
Dubna is a river in Vladimir Oblast and Moscow Oblast in Russia, a right tributary of the Volga. The length of the river is 167 kilometres. The area of its basin is 5,350 km². Its largest tributary is the Sestra. The town of Dubna is located at the confluence of the Dubna and Volga rivers.
Mtsensk is a town in Oryol Oblast, Russia, located on the Zusha River 49 kilometers (30 mi) northeast of Oryol, the administrative center of the oblast. Population: 43,222 (2010 Census); 47,807 (2002 Census); 48,400 (1989 Census); 28,000 (1970).
The Seym is a west-flowing river in Russia and Ukraine. Its length is 748 kilometres (465 mi) and its basin area about 27,500 square kilometres (10,600 sq mi). It is the largest tributary of the Desna.
The Neruch is a river in Oryol Oblast in Russia, a left tributary of the Zusha. It is 111 kilometres (69 mi) long, and has a drainage basin of 1,540 square kilometres (590 sq mi).
The Chapayevka is a river in Samara Oblast, Russia, a left tributary of the Volga. It origins at the slope of Siny Syrt and flows to the Saratov Reservoir, near Novokuybyshevsk, Samara agglomeration. It is 298 km long and its drainage basin is 4,310 km². The town of Chapayevsk lies along the river. The river is navigable for 34 km, from its mouth to Chapayevsk. The river has snow feeding and dries up in the upper stream. Since November till April it is used to be frozen. Major inflows are Petrushka, Vetlyanka, Vyazovka.
The Great Tsivil or simply Tsivil in its lower course is a river in Chuvashia, Russian Federation, a right tributary of the Volga. The Tsivil is 170 km (110 mi) long, its watershed area is 4,690 km2 (1,810 sq mi). Near Tsivilsk the Maly Tsivil joins the Bolshoy Tsivil, forming Tsivil river, which flows into the Volga near Novocheboksarsk. Other major tributaries are the Unga and Kuganar. Tsivil yearly runoff volume is 640,000,000 m3 (520,000 acre⋅ft).
The Or is a river in Orenburg Oblast of Russia and Aktobe Province of Kazakhstan. It is a left tributary of the Ural, and is 332 km long, with a drainage basin 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, and it joins the Ural by the city of Orsk. 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.
The Gilyuy is a river in Amur Oblast, Russia. It is a right tributary of the Zeya, and is 545 km long, with a drainage basin of 22,500 km². The river has its sources on the southern slopes of the Stanovoy Mountains, passes near Tynda and flows southeast into the Zeya Reservoir.
The Razdolnaya or Suifen is a river in People's Republic of China and Russia. It flows into the Amur Bay of the Sea of Japan.
The Ubagan is a river of Kazakhstan and Russia, a right tributary of the Tobol. It has a length of 376 km (234 mi), and a catchment area of 50,700 km2 (19,600 sq mi), with water supplied by melting snow. In the summer the water is brackish.
The Samur is a river in Russia's Dagestan Republic, also partially flowing through Azerbaijan and forming part of the Azerbaijan–Russia border.
The Marasa is a river in Russia that flows through the territory of the Alekseevsky and Nurlatsky District of Tatarstan.
