The present Ghaggar-Hakra River is a seasonal river in India and Pakistan that flows only during the monsoon season, but satellite images in possession of the ISRO and ONGC have confirmed that the major course of a river ran through the present-day Ghaggar River. At least 10,000 years ago, well before the rise of the Harappan civilization, the Ghaggar-Hakra lost its glacier sources when the Yamuna and the Sutlej diverted their courses, leaving a monsoon-fed river flowing into the Nara river bed, a delta channel c.q.paleochannel of the Indus River. Early in the 2nd millennium BCE the monsoons diminished and the Ghaggar-Hakra fluvial system dried up, which affected the Harappan civilisation.