Northern Haryana has several north-east to south-west flowing rivers originating from the Sivalik Hills of Himalayas, such as Ghaggar-Hakra (palaeochannel of vedic Sarasvati river), Chautang (paleochannel of vedic Drishadvati river, tributary of Ghagghar), Tangri river (tributary of Ghagghar), Kaushalya river (tributary of Ghagghar), Markanda River (tributary of Ghagghar), Sarsuti, Dangri, Somb river. Haryana's main seasonal river, the Ghaggar-Hakra, known as Ghaggar before the Ottu barrage and as the Hakra downstream of the barrage, rises in the outer Himalayas, between the Yamuna and the Satluj and enters the state near Pinjore in the Panchkula district, passes through Ambala and Sirsa, it reaches Bikaner in Rajasthan and runs for before disappearing into the deserts of Rajasthan. The seasonal Markanda River, known as the Aruna in ancient times, originates from the lower Shivalik Hills and enters Haryana west of Ambala, and swells into a raging torrent during monsoon is notorious for its devastating power, carries its surplus water on to the Sanisa Lake where the Markanda joins the Sarasuti and later the Ghaggar.