An average of less than 1,000 millimeters of rain falls per year across most of Africa (Map 1). Rainfall tends to decrease with distance from the equator and is negligible in the Sahara (north of about latitude 16°N), in eastern Somalia, and in the southwest of the continent in Namibia and South Africa. Rainfall is most abundant on the eastern seaboard of Madagascar; portions of the highlands in eastern Africa; large areas of the Congo Basin and central Africa; and parts of coastal western Africa including Liberia, Sierra Leone, and Guinea. Continue reading →