The Piz () is a right tributary of the river Buy in Perm Krai, the Republic of Bashkortostan and the Republic of Udmurtia, Russia. It is long, with a drainage basin of .«Река ПИЗЬ», Russian State Water Registry It starts in the Yelovsky District of Perm Krai, then flows through Chaikovsky District on the border with Bashkortostan. It empties into the Buy on the border between the Udmurt Republic and Bashkortostan, from the larger river's mouth.
Main tributaries: Left: Bolshaya Usa Right: Posha
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