The Ugra () is a river in

Smolensk Smolensk ( rus, Смоленск, p=smɐˈlʲensk, a=smolensk_ru.ogg) is a city and the administrative center of Smolensk Oblast, Russia, located on the Dnieper River, west-southwest of Moscow. First mentioned in 863, it is one of the oldest ...

and

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. G ...

s in Russia, left tributary of the

Oka Oka or OKA may refer to: Cars * Oka (automobile), a small car designed by AvtoVAZ and produced by ZMA and SeAZ * OKA 4wd, a large 4-wheel-drive vehicle made in Western Australia by OKA Military * 2B1 Oka, Soviet 420 mm self-propelled mort ...

. The east-flowing Ugra joins the north-flowing Oka at

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 Tsi ...

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

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 Centr ...

References

External links

The Ugra River: photos
Rivers of Kaluga Oblast Rivers of Smolensk Oblast {{Russia-river-stub