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Ugra River (Oka)

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Title: Ugra River (Oka)  
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Subject: Battle of Smolensk (1943), List of rivers of Russia, Vorotynsk, Peremyshlsky District, Kaluga Oblast, Kondrovo, Kaluga Oblast, Expansion of Russia 1500–1800
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Ugra River (Oka)

A picture of the river.

Ugra (Russian: Угра́) is a river in Smolensk and Kaluga Oblasts in Russia, left tributary of the Oka River. 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 juncture 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 399 km and its basin 15,700 square km. It is frozen from late

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