The Ugra () is a river in

Smolensk Smolensk 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 cities in Russia. It has been a regional capital for most of ...

and

Kaluga Oblast Kaluga Oblast () is a federal subjects of Russia, federal subject of Russia (an oblast). Its administrative center is the types of inhabited localities in Russia, city of Kaluga. The Russian Census (2021), 2021 Russian Census found a population o ...

s in Russia, left tributary of the Oka. The east-flowing Ugra joins the north-flowing Oka at

Kaluga Kaluga (, ) is a types of inhabited localities in Russia, city and the administrative center of Kaluga Oblast, Russia. It stands on the Oka River southwest of Moscow. Its population was 337,058 at the 2021 census. Kaluga's most famous residen ...

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 () is a national park in central Russia, located in Kaluga Oblast, in the valley of the Ugra River (Oka), Ugra River. It was established on 10 February 1997 to protect typical landscapes of Central Russia. In 2002, it was design ...

References

External links

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