Was the nile river part of the topography egypt

Egypt - Topography

The narrow valley of the Nile is enclosed by cliffs as high as 550 m (1,800 ft) as the river flows about 900 km (560 mi) from Aswan to Cairo. ... The outstanding topographic feature is the Nile River, on which human existence depends, for its annual floods provide the water necessary for agriculture.

He made the polygraph too,but thomas edison was not falsely credited for the light buld