"Scholars such as Romila Thapar, Irfan Habib and the late RS Sharma started questioning this identification in the 1980s. What prompted this rather late reaction? It was a new development: A study of the evolution of the pattern of Harappan settlements in the Saraswati basin now revealed that in its central part — roughly southwest Haryana, southern Punjab and northern Rajasthan — most or all Harappan sites were abandoned sometime around 1900 BCE, a period coinciding with the end of the urban phase of the Indus civilisation. Clearly, the river system collapsed — which archaeologists now saw as a factor contributing to the end of the brilliant Indus civilisation. Why was this a problem? We must remember that the Saraswati is lavishly praised both as a river and a Goddess in the Rig Veda, a collection of hymns which mainstream Indology says was composed by Indo-Aryans shortly after their migration to India around 1500 BCE. However, by that time, the Saraswati had been reduced to a minor seasonal stream: How could the said Aryans praise it as a ‘mighty river’, the ‘best of rivers’, ‘mother of waters’, etc? There is a chronological impossibility. Hence, the objectors asserted, the Ghaggar-Hakra was not, after all, the Saraswati extolled in the Rig Veda. While some (Rajesh Kochhar) tried to relocate the river in Afghanistan, others (Irfan Habib) decided that the Saraswati was not a particular river but “the river in the abstract, the River Goddess”; but both theses ran against the Rig Veda’s own testimony that the river flowed between the Yamuna and the Sutlej."