Tibet (/tɪˈbɛt/ ), Xizang or Hsi-tsang is a region in the western part of East Asia, covering much of the Tibetan Plateau. It is the homeland of the Tibetans. Other ethnic groups also reside on the plateau, including Mongols, the Monpa, the Tamang, the Qiang, the Sherpa, the Lhoba, and since the 20th century, the Han and the Hui. Tibet is the highest region on Earth, with an average elevation of 4,380 m (14,000 ft). Lying within the Himalayas, the highest point in Tibet is Mount Everest – the highest peak on Earth, standing 8,848 m (29,000 ft) above sea level.
The Tibetan Empire emerged in the 7th century. At its height in the 9th century, the Tibetan Empire extended far beyond the Tibetan Plateau, from the Tarim Basin and Pamirs in the west, to Yunnan and Bengal in the southeast. It then collapsed and divided into a variety of territories in the 9th century after the battle of U-Yor (Chinese:伍约之战 Tibetan:དབུ་གྱོར་བཁྲུག་པ་བྱས). Lhasa was central part of Wu Ru (Chinese:伍如 Tibetan: དབུ་རུ), the battle of U-Yor lasted for 12 years in Wu Ru and also marked the end of Wu Ru.