Three large rivers ran through the Sahara Desert about 100,000 years ago, creating oases in the arid landscape, according to research published in PLoS ONE. "These rivers were big. They were about the same as the Missouri or the Rhine or even the Nile when it's low flow," said University of Hull hydrologist Thomas Coulthard, the study's co-author. Researchers say these now-buried rivers could have helped ancient humans migrate across the Sahara.

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