Tibetans live on the Qinghai-Tibetan plateau. The plateau is bounded by the Himalayas in the southwest and the Kunlun and Aljin mountains in the northeast. "The roof of the world" towers over southwestern China at an average elevation of 4000 m above sea level. Covering more than 2.5 million km(2), the Qinghai-Tibetan plateau is the highest and largest plateau in the world. The plateau has a highland continental climate and a very complex topography with great variations. 90% of the people of Tibetan ethnic descent are engaged in farming and herding. Mining activities in the plateau have sustained a part of the population.
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