Yamzhach
Yamzhach () is a river in Perm Krai, Russia, a left tributary of the Kolva, which in turn is a tributary of the Vishera. The river is  long. It flows into the Kolva  from the Kolva's mouth. The main tributaries are the Passavozh (left) and Zapadnaya (left) rivers. References 

Rivers of Perm Krai