Input (grade 13): It is largely an arid plateau with the Marrah Mountains (Jebel Marra), a range of volcanic peaks rising up to 3042 m of topographic prominence, in the center of the region.
Output (grade 12): It is largely an arid plateau with the Marrah Mountains (Jebel Marra), a range of volcanic peaks rising up to 3000 m (10,100 ft), in the center of the region.