Where is the Sahara Desert?

"Imagine over three million square miles of sand dunes that are as tall as a ten-story building. That place is real--it's the Sahara Desert! Vast . . . and home to . . . creatures such as ostriches and fennec foxes as well as amazing plant life. Readers will also learn about the famous trade routes of the past with caravans of up to 10,000 camels, European explorers to the region . . . and native populations like the Imazighen"--Provided by publisher.