The dark area at right-center to the left of the bend in the Nile River in NE Sudan is the Jebel Umm Arafieb volcanic field, also known as Jebel Umm Marafieb. Located in the Bayuda Desert NE of the capital city of Khartoum, this volcanic field consists of a low-angle shield volcano formed of several overlapping aa lava flows erupted from a vent now capped by a spatter cone.

NASA Space Shuttle image STS81-ESC-8221240, 1997 (http://eol.jsc.nasa.gov/).

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Jebel Umm Arafieb