It is the world's largest hottest desert. It is over 3 1/2 million square miles in total circumference. It has some sand dunes over 590 feet high and one mountain is called Emi Koussi and its elevation is 11204 feet and its found in Chad. IN it they have found humonguous large dinosaur bones, gigantic live crocodiles so plz go here and see: http://en.wikipedia.org/wiki/Sahara for more details
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