Siul River, the largest tributary of the Ravi River, originates from the tract between the Dhauladhar and Pir Panjal ranges near Jammu and Kashmir and Himachal Pradesh border. The river flows in the east direction, then takes a ‘U’ turn and attains a south-west flow, before draining into the Ravi River downstream of Chamba.

River Baira is a prominent tributary of Siul River.