Pre-Holocene diversion of the Sutlej and Yamuna Older publications have suggested that the Sutlej and the Yamuna drained into the Hakra well into Mature Harappan times, providing ample volume to the supply provided by the monsoon-fed Ghaggar. The Sutlej and Yamuna then changed course between 2500 BCE and 1900 BCE, due to either tectonic events or "slightly altered gradients on the extremely flat plains," resulting in the drying-up of the Hakra in the Thar Desert. More recent publications have shown that the Sutlej and the Yamuna shifted course well before Harappan times, leaving the monsoon-fed Ghaggar-Hakra which dried-up during late Harappan times.
pre-hoLOCene diVErsion Of tHe sutleJ AnD Yamuna older publications Have SUgGested that the sutlej anD thE yaMUNa drained inTo the hAkra well into maTUre haRaPPAn times, proVIding Ample VolumE to The suppLy ProviDed BY the monSoon-fED gHaggar. the sutleJ AND yamuna Then CHanGed cOuRSe beTween 2500 bce aNd 1900 bcE, due to eItHEr tectOniC evenTs oR "SLightly aLtered gradiENts oN The ExtREMeLY FlAt plaIns," resUlTing iN The dryinG-up of The haKra iN the thaR dEsErt. more recenT pUBlicatIoNs have shoWN tHat thE suTlEJ aNd THE Yamuna shiFted cOuRSe wELL Before hArAPPan tiMEs, leAVing THe moNsoON-fed GHAGgar-hakRa whiCH drIed-uP durinG Late haRappAn timES.