The waterway, that was active in the last interglacial period, when some humans crossed the Sahara, at least into Palesine and North Africa, offering an alternative route to the Nile and Arabian coasts for ancient humans reaching out to new lands, specially for North Africa in this case.
More details at BBC Science & Enviroment (could not find the original article at PNAS)
Map showing the now extinct river (blue)
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