The Kocasu Creek, also called Hınıs Çayı (Turkish: Kocasu Çayı), is one of the tributaries of the Murat River in the Eastern Anatolia Region of Turkey. It is 100 km long.
During the eroding factors and processes of volcanic activities on Bingöl Mountains, valleys were formed from various stair-like steps or levels from bottom to top. Kocasu Creek is originates from the Bingöl Mountains in the west of Hınıs and north of Varto. It consists of a combination of more than 20 streams coming from the valleys extending horizontally from the west to Hınıs. After taking the waters descending from the Akdoğan Mountains, passing through Karaçoban, it descends from the Malazgirt border to the borders of Bulanık district and mixes with the Murat River near Sarıpınar village
