"Another ancient river, the Saraswati or Ghaggar-Hakra had taken its course along the eastern edge of the plain. Numerous surveys in the deserts of Cholistan and Rajasthan made it clear that large numbers of settlements dating from the fourth to the first millennium B.C. were situated along the banks of this other major river system . . . Now that we know of the presence of the ancient Saraswati river (also known as the Ghaggar-Hakra along its central stretches), some scholars refer to this culture as the Indus-Sarasvatī civilization."