A wonderful link to support your theory! Especially the part
"At some time in the past though, the Nile flowed on a different course. Discovering the river channel shows us that probably sometime between 10,000 and 1,000,000 years ago, the Nile was forced to abandon its course and take up a new course to the south..."
I only hope that there indeed is a place for Aqarius upstream Euphrates & Tigris ;-)
Al the best,