Usva (river)

The Usva (Усьва) is a river in Perm Krai in Russia, a right tributary of the Chusovaya (Kama basin). The river is 266 km long, and its drainage basin covers 6170 km2.

The Usva freezes up in the month of November and remains icebound until late April or early May. This is a lowland river for most of its course except upstream, where it has many rocks and rapids. Its banks are steep and rocky, covered with forests. The Usva crosses the Basegi range, which reaches 951 m in elevation at North Baseg. There are seven localities on the banks of the river and some abandoned villages. The town of Chusovoy is at the confluence of the Usva and the Chusovaya rivers.

Main tributaries:
 * Left: Vilva, Bolshaya Khariusnaya, Malaya Khariusnaya, Porozhnaya;
 * Right: Suriya, Berezovka, Persha, Tulumovka.

Etymology
The most believable explanation of the name is that it is a composite of the Komi-Permyak words usyny (to fall) and va (water); then it can be translated as "falling water".