The Beas River originates at an elevation of 3,960 metres (12,990 ft) in Rohtang Pass in the Punjab Himalayas of Himachal Pradesh. It flows south past Manali and through the Kullu Valley before entering the Punjab plains. It meets the Sutlej River near the Harike Wetland south of Amritsar. The Sutlej continues into Pakistani Punjab and joins the Chenab River at Uch near Bahawalpur to form the Panjnad River; the latter in turn joins the Indus River at Mithankot.The waters of the Ravi, Beas (Vipasha) and Sutlej (also known as Shathadru) rivers are allocated to India under the Indus Waters Treaty between India and Pakistan.
The river was also known as Arjikuja of the Vedas or Vipasa to the ancient Indians and the Hyphasis to the Ancient Greeks.The present name Beas is thought to be a corruption of the older name and original name Vipasha in Sanskrit. The river got this name, Vi-pasha, the one who removed the bondage or pasha in Sanskrit), according to ancient texts, the river was named after sage Vasistha. Vasistha, tried to end his life due to the death of his 100 sons, by jumping into this river and tying himself. But as soon as the sage fell into the river, all the knots got untied and he did not die. The river is also referred to as Vipasha in Himachal, especially by the scholars.