| 词条 | Ugra River (Oka) |
| 释义 |
Ugra ({{Lang-ru|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 {{convert|399|km}} and its basin {{convert|15700|km2}}. 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 Ugra National Park.[1] References1. ^{{cite web|url=http://www.parkugra.ru/index/obschie-svedeniya.html|title=Общие сведения о парке|publisher=Ugra National Park|language=Russian|accessdate=31 December 2015}} External links{{Commons category|Rivers of Kaluga Oblast}}
3 : Rivers of Kaluga Oblast|Rivers of Smolensk Oblast|Volga basin |
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