The Nile river is 4,160 mi. long. The Nile is the longest river in the world. The Nile river is an important source of hydroelectric power.
The Kalahari desert is an arid plateau region. The Kalahari is 100,000 square miles. The Kalahari is covered mostly by redish sand.
A system of ranges and plateaus in northwest Africa. 1,500 miles from southwest Morocco through Algeria to north Tunisia. fertile lowlands separate the ranges. Rich in minerals, especially phosphates, coal, iron, and oil.
Great Rift Valley
Elevation from 1,300 ft. bellow sea level at the dead sea to 6,000 ft. above sea level in southern Kenya. Cliffs several thousand ft. high. Erosion has leveled out much of the valley.