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)
Tibesti in American English
(tɪˈbɛsti)
mountain group of the Sahara, mostly in NW Chad: highest peak, 11,204 ft (3,415 m)