Sahara

The Sahara (Arabic: الصحراء الكبرى‎, aṣ-Ṣaḥrāʾ al-Kubrā , 'the Great Desert') is the largest subtropical hot desert and third largest desert after Antarctica and the Arctic. At over 9,400,000 square kilometres (3,600,000 sq mi), it covers most of North Africa, and is nearly the area of China or the United States. The Sahara stretches from the Red Sea in the east, including parts of the Mediterranean, to the Atlantic Ocean in the west. To the south, it is delimited by the Sahel, a belt of semi-arid tropical savanna that composes the northern region of central and western Sub-Saharan Africa.

• http://en.wikipedia.org/wiki/Sahara