Vipasa or beas was a much longer river until about a 1000 years ago, when Sutlej changed course abandoning its old channel in southwestern Punjab near Bathinda and took a westerly turn from east of Ludhiana towards Harike beyond there it now flows in the old channel of Beas down to Pakistan, there is a dried up channel from the old Beas river bed just to the west of Ferozepur as the Beas now joins Sutlej at Harike instead of taking a U-turn like bend from Kasur before coming back to the present Sutlej channel(old beas channel) south-west of ferozepur as it did about a millenium ago, people living downstream from the confluence of sutlej and beas still call the river Beas, even though Sutlej is clearly the larger river, also they call the dried up channel west of ferozepur near Kasur, sukka Beas(dried up Beas). Geologists have discovered that Beas joined Satluj west south-west of Abohar near Sulemanke and Hindumalkot before Sutlej changed its course towards Harike to meet Beas several hundered kilometers upstream.
