Buy (river)

Buy (Буй; Беүә, Bewä) is a river in Perm Krai, the Republic of Bashkortostan and the Republic of Udmurtia, Russia. It is a left tributary of the Kama. It is 228 kmlong, with a drainage basin of 6530 km2.

It starts in the south of Perm Krai, in the Kuyedinsky District. Then, it flows through northwestern Bashkortostan and into the Kama River within the Udmurt Republic, to the south of the town of Kambarka.

Main tributaries:
 * Left: Arey (river), Amzya (river)
 * Right: Oshya (river), Piz