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Tibesti Massif:see SaharaSahara
[Arab.,=desert], world's largest desert, c.3,500,000 sq mi (9,065,000 sq km), N Africa; the western part of a great arid zone that continues into SW Asia. 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
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Tibesti, Tibesti Massif
a mountain range of volcanic origin in NW Chad, in the central Sahara extending for about 480 km (300 miles). Highest peak: Emi Koussi, 3415 m (11 204 ft.)