The Sahara's regions of wind-swept sand are called ergs, whereas the rocky, gravelly plateaus are called hamadas. The Sahara also has groups of mountains called massifs, some of which rise to more than 3,350 meters (11,000 feet).
How Much Sand Is In The Sahara Desert?
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Key Facts In This Video
The Sahara Desert covers most of North Africa. 00:12
Most of the Sahara Desert consists of rocky plateaus and gravel plains, not sand. 01:45
There are many more grains of sand in the Sahara Desert than there are stars in the Milky Way. 03:08
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