evidence: Tibet, historic region and autonomous region of China that is often called "the roof of the world." It occupies a vast area of plateaus and mountains in Central Asia, including Mount Everest (Qomolangma [or Zhumulangma] Feng; Tibetan: Chomolungma). It is bordered by the Chinese provinces of Qinghai to the northeast, Sichuan to the east, and Yunnan to the southeast; by Myanmar (Burma), India, Bhutan, and Nepal to the south; by the disputed Kashmir region to the west; and by the Uygur Autonomous Region of Xinjiang to the northwest. Lhasa is the capital city. The name Tibet is derived from the Mongolian Thubet, the Chinese Tufan, the Tai Thibet, and the Arabic Tubbat.