The sources of the Nile from a ms of Idrissi.

Moses Bar Kepha: Hexaemeron (Six-Day Creation) (d903) Syrian bishop

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Taken from:  Baumstark-Reichert; LThK 7, 654 Stuiber

 

Book 5, Ch. 5: [One of the gulfs of the Red Sea] is the gulf known as the Arabian: ... it flows from the country of the Kushaye to the desert of Faran ... its length is 1400 miles, its width 200 miles.
There are two lakes which feed the river Nilos, and also another lake, called Qolon, which feeds the River Astafinos, which flows into the Nilos.