The overwhelming evidence today, therefore, is that what shrunk the Ghaggar–Hakra was not a tectonic event that stole its waters and gave it to the Ganga or the Indus, but a mega drought that had global impact. To reiterate, the Ghaggar was a monsoon-fed river that was weakened by monsoon failure, and not a mighty, snow-fed river that was used to ‘breaking mountaintops’ as migration denialists insist.
