The river rises from beyond Indian borders on the Southern slopes of the Kailash mountain near Mansarover lake. It is the largest among the five rivers of Himachal Pradesh. It is the longest of the five tributaries of the Indus River. It flows almost parallel to the Indus for about 400km before entering India and comes out of a gorge at Rupar.

Which of the following river is being described in the above passage?