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Ugra River (Oka)
The Ugra () is a river in Smolensk and Kaluga Oblasts in Russia, left tributary of the Oka. The east-flowing Ugra joins the north-flowing Oka at Kaluga and the united river, called the Oka, continues east to the Volga. In the 16th century, the Ugra-Oka confluence was the western end of a line of forts protecting Muscovy from Tatar raids. The river is known for the Great stand on the Ugra River. Its length is and its basin .«Река УГРА»
Russian State Water Registry
It is frozen from late November (sometimes as late as January) until the end of March. 60% of its annual flow is snowmelt, mostly in April. A part of the valley of the Ugra located in Kaluga Oblast belongs to

Russia
Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eighth of Earth's inhabitable landmass. Russia extends across eleven time zones and shares land boundaries with fourteen countries, more than any other country but China. It is the world's ninth-most populous country and Europe's most populous country, with a population of 146 million people. The country's capital and largest city is Moscow, the largest city entirely within Europe. Saint Petersburg is Russia's cultural centre and second-largest city. Other major urban areas include Novosibirsk, Yekaterinburg, Nizhny Novgorod, and Kazan. The East Slavs emerged as a recognisable group in Europe between the 3rd and 8th centuries CE. Kievan Rus' arose as a state in the 9th century, and in 988, it adopted Orthodox Christianity from t ...
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Oka (river)
The Oka (russian: Ока́, ) 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 the town of Kaluga. Its length is and its catchment area is .«Река Ока»
Russian State Water Registry
The Russian capital sits on one of the Oka's tributaries—the Moskva.


Name and history

The Oka river was the homeland of the Eastern Slavic Vyatich ...
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Smolensk Oblast
Smolensk Oblast (russian: Смоле́нская о́бласть, ''Smolenskaya oblast''; informal name — ''Smolenschina'' (russian: Смоле́нщина)) is a federal subject of Russia (an oblast). Its administrative centre is the city of Smolensk. As of the 2010 Census, its population was 985,537. Geography The oblast was founded on 27 September 1937.Исполнительный комитет Смоленского областного совета народных депутатов. Государственный архив Смоленской области. "Административно-территориальное устройство Смоленской области. Справочник", изд. "Московский рабочий", Москва 1981. Стр. 8 It borders Pskov Oblast in the north, Tver Oblast in the northeast, Moscow Oblast in the east, Kaluga Oblast in south, Bryansk Oblast in the southwest, and Mogilev and Vitebsk Obla ...
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Kaluga Oblast
Kaluga Oblast (russian: Калу́жская о́бласть, translit=Kaluzhskaya oblast) is a federal subject of Russia (an oblast). Its administrative center is the city of Kaluga. The 2021 Russian Census found a population of 1,069,904. Geography Kaluga Oblast lies in the central part of the East European Plain. The oblast's territory is located between the Central Russian Upland (with and average elevation of above and a maximum elevation of in the southeast), the Smolensk–Moscow Upland and the Dnieper– Desna watershed. Most of the oblast is occupied by plains, fields and forests with diverse flora and fauna. The administrative center is located on the Baryatino-Sukhinichy plain. The western part of the oblast — located within the drift plain — is dominated by the Spas-Demensk ridge. To the south is an outwash plain that is part of the Bryansk-Zhizdra woodlands, with average elevation up to 200 m. From north to south, Kaluga Oblast extends for more ...
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Kaluga
Kaluga ( rus, Калу́га, p=kɐˈɫuɡə), a city and the administrative center of Kaluga Oblast in Russia, stands on the Oka River southwest of Moscow. Population: Kaluga's most famous resident, the space travel pioneer Konstantin Tsiolkovsky, worked there as a school teacher from 1892 to 1935. The Tsiolkovsky State Museum of the History of Cosmonautics in Kaluga is dedicated to his theoretical achievements and to their practical implementations for modern space research, hence the motto on the city's coat of arms: , ''Kolybélʹ kosmonávtiki'' (''The Cradle of Space-Exploration''"). History Kaluga, founded in the mid-14th century as a border fortress on the southwestern borders of the Grand Duchy of Moscow, first appears in the historical record in chronicles in the 14th century as ''Koluga''; the name comes from Old Russian ''kaluga'' - "bog, quagmire". During the period of Tartar raids it was the western end of the Oka bank defense line. The Great stand on the ...
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Great Stand On The Ugra River
The Great Stand on the Ugra River (russian: Великое cтояние на реке Угре, also russian: Угорщина, translit=Ugorshchina, derived from " Ugra") was a standoff between the forces of Akhmat Khan of the Great Horde, and the Grand Prince Ivan III of Muscovy in 1480 on the banks of the Ugra River, which ended when the Tatars departed without conflict. It is seen in Russian historiography as the end of the vassalage of Muscovy.Michael Khodarkovsky, ''Russia's Steppe Frontier: The Making of a Colonial Empire, 1500–1800'' (Indiana University Press, 2002), 80. Background The main Russian defence line ran along the Oka River from Kaluga east toward Nizhny Novgorod. At Kaluga the Oka bends sharply from north to east and the defense line was extended westward along the Ugra River. The land west and south of Kaluga was claimed by Lithuania. At this time Ivan III was uniting the lands north of the Oka. At the same time the Golden Horde was breaking up and th ...
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Ugra National Park
Ugra National Park (russian: Национальный парк Угра) is a national park in central Russia, located in Kaluga Oblast, in the valley of the Ugra River. It was established on 10 February 1997 to protect typical landscapes of Central Russia. In 2002, it was designated a UNESCO biosphere reserve. The headquarters of the national park are located in Kaluga. Geography The total area of the park is . It consists of seven clusters grouped into three areas, * The northern part comprises the valley of the Ugra from the border with Smolensk Oblast downstream to the village of Kurovskoye. This part is split between Dzerzhinsky, Iznoskovsky, and Yukhnovsky Districts; * The southern part includes the valley of the Zhizdra River down to its mouth; it belongs to Kozelsky and Peremyshlsky Districts; * The Vorotynsk part, the smallest of the three, surrounds the selo of Vorotynsk and is split between Babyninsky and Peremyshlsky Districts. Mammals in the park include moose ...
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Rivers Of Kaluga Oblast
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as creek, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, "burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague. Rivers are part of the water cycle. Water generally collects in a river from precipitation through a drainage basin from surface runoff and other sources such as groundwater recharge, spring ...
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