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![Satellite image of the Sahara](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Sahara_satellite_hires.jpg/500px-Sahara_satellite_hires.jpg)
A satellite image of the Sahara, the world's largest hot desert and second largest desert after Antarctica at over 9,000,000 km² (3,500,000 mi²), almost as large as the United States. The Sahara is located in Northern Africa and is 2.5 million years old.