Erin Ross Nov 28
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Indus Valley civilization may have arisen without a river

Kalibangan is sited on the topographically higher margins of the palaeochannel. Credit: S. Gupta (Imperial College London)

History texts teach that the Indus Valley society, one of the earliest known human civilizations, arose along the banks of the Sutlej River. But a new study published in Nature Communications suggests the river may have shifted away from the area 3,000 years before humans built their cities, writes Jonathan Amos at the BBC.

What's different: Other ancient civilizations, like Egypt and Mesopotamia, were built and flourished along rivers with consistent water. The authors of this study believe that in contrast, the Indus Valley civilizations depended on seasonal floods from monsoon rains.