River, Asia.
The longest of the "Five Rivers" that give Punjab its name, it is 900 mi (1,450 km) long. It rises in southwestern Tibet and flows west through the Himalayas , across Himachal Pradesh and Punjab, India, then southwest across Punjab province of Pakistan. It forms 65 mi (105 km) of the Indo-Pakistani border. It joins the Chenab River in Pakistan to become the Panjnad, the link between the Five Rivers and the Indus . Its middle course is used extensively for irrigation.