On the Pakistan side, archaeological evidence now available overwhelmingly affirms that the Hakra was a perennial river through all its course in Bahawalpur during the fourth millennium B.C. (Hakra Period) and the early third millennium B.C. (Early Harappan Period).
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Mughal, M. Rafique, ‘Recent Archaeological Research in the Cholistan Desert’, in Possehl, Gregory L., (ed.), Harappan Civilization : A Recent Perspective, , p. 94.in Danino, M. (2010). The lost river : on the trail of the Sarasvatī. Penguin Books India.