The Beas River, on which the Pong Dam is located, is one of the five major rivers of the Indus basin. The river flows from the Beas Kund near Rohtang Pass, in the upper Himalayas, and traverses generally in a north-south direction until Largi, from where it turns sharply at nearly a right angle and flows in a westerly direction up to the Pong Dam. The river traverses a total length of about from the source to the Pong Dam.