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| | Sahara on Encyclopedia.com (Site not responding. Last check: 2007-10-08) |
 | | Extending more than 3,000 mi (4,830 km), from the Atlantic Ocean to the Red Sea, the Sahara is bounded on the N by the Atlas Mts., steppelands, and the Mediterranean Sea; it stretches south c.1,200 mi (1,930 km) to the Sahel, a steppe in W and central Africa that forms its southern border. |
 | | The E Sahara is usually divided into three regions—the Libyan Desert, which extends west from the Nile valley through W Egypt and E Libya; the Arabian Desert, or Eastern Desert, which lies between the Nile valley and the Red Sea in Egypt; and the Nubian Desert, which is in NE Sudan. |
 | | Regions of sand dunes (erg) occupy only about 15% of the Sahara; stone deserts, consisting of plateaus of denuded rock (hammada) or areas of coarse gravel (reg), cover about 70% of the region; mountains, oases, and transition zones account for the remainder. |
| www.encyclopedia.com /html/s/sahara.asp (902 words) |
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