"Scientific data and new evidence converge on the understanding that between 3000 and 2000 BCE (about 4,000 years ago), the river's demise began when Sutlej diverted from the present-day Ghaggar-Hakra valley to join the river Beas. By around 3792 BP (c. 1800 BCE), the river had completely dried up."

https://theprint.in/opinion/first-we-lost-saraswati-river-no...