The Koyva () is a river in Perm Krai in Russia, a tributary of the Chusovaya (Kama's basin). The river is long, and its drainage basin covers . 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, 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:
Name of river is a composition of Komi-Permyak words âÂÂkoyâ (splash) and âÂÂvaâ (water).