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The Sahara Desert encompasses a large portion of North Africa and is not just one huge expanse of sand; it is comprised of sand fields, mountain ranges and rocky outcrops.

Many cities and towns are actually located within the loose geographic area which is known as the Sahara Desert.

I believe the question is more on how the nomadic inhabitants of the area live and work. By definition they move from area to area depending on the season and supply of water. Most could be defined as traders or nomadic farmers (camel, goats).

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