The Drishadvati was identified by Oldham as the Chautang River, and in 2000 Talageri identified it with the Hariyupiya and Yavyavati Rivers. In 1871 Alexander Cunningham identified the Rakshi River as the old Drishadvati and demonstrated its flow to have been from Chunar, near Varanasi. According to the Brahman Granthas, before its confluence with the Saraswati the Drishadwati flowed from the east to west. The Saraswati flowed from north to south during the Vedic period close to Aravallies, and the Drishadwati flowed from south to north through the Aravallis from Pushkar Lake in Rajasthan to Nangal Chaudhery in southern Haryana. The river then turned to reach Satnali and meet the Saraswati. After major tectonic/seismic activity in the Aravalli Range some 6500 years ago, the river Saraswati changed its course, to what is now known as Ghaggar-Hakra river bed at present times, and dried up later.