A mega-lake in today’s hyper-arid western Egypt might have been fed by the earliest Nile floods.

The discovery helps explain fish fossils in the desert.An alternative hypothesis is that the mega-lake fed the Nile, not the other way around.

Fossil fish and space shuttle radar images have defined the bed and drainage channels of the long lost lake, which at times was larger than Lake Michigan, stretching as far as 250 miles west of the Nile in southwestern Egypt.

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