When exploring this map, you should keep the following in mind:
Most Africans live south of the Sahara. Africa south of the Sahara has about 355 million more people than the United States.
The eastern and southern areas of Africa are called "High Africa." Most of the area is more than 3,000 feet (910 m) above sea level.
The Great Rift Valley is a series of deep, steep-sided valleys formed by parallel cracks in the earth.
The oldest bones and fossils ever discovered have been found in eastern and southern sites in Africa. These findings give Africa the title "birthplace of the human race."