Koyva

The Koyva (Койва) is a river in Perm Krai in Russia, a right tributary of the Chusovaya (Kama's basin). The river is 180 km long, and its drainage basin covers 2250 km2. It starts on the western slope of the Ural Mountains, on the slopes of Mount Bolshaya Khmelikha. Its mouth is near the settlement Ust-Koyva, 66 km from the mouth of the Chusovaya River. It is a mountain river with many rapids and shoals.

It was along the Koyva that the first ever diamonds were found in 1829 in Russia. There are urban-type settlement Tyoplaya Gora situated by the river.

Main tributaries:
 * Left: Tiskos, Tyrym, Olkhovka;
 * Right: Biser, Kusya.

Etymology
Name of river is a composition of Komi-Permyak words ‘koy’ (splash) and ‘va’ (water).