This river is fed by the wetlands of Haft Emarat, Bollaq Jak, Abbasabad and Panjeh Ali along the borders of Arak city.
After irrigating surrounding lands and flowing in an east-west direction, it enters Tafresh city. After taking in water from other rivers and after crossing southern Saveh in the vicinity of Pol-e-Dalak, it adjoins Qamarroud and flows into Qom Lake at a distance of 76 km to its east.