Kham (; ) is one of the three traditional Tibetan regions, the others being Amdo in the northeast, and Ü-Tsang in central Tibet. The original residents of Kham are called Khampas (), and were governed locally by chieftains and monasteries. Kham presently covers a land area distributed between five regions in China, most of it in Tibet Autonomous Region and Sichuan, with smaller portions located within Qinghai, Gansu and Yunnan provinces. Densely forested with grass plains, its convergence of six valleys and four rivers supported independent Kham polities of Tibetan warrior kingdoms together with Tibetan Buddhist monastic centers. The early trading route between Central Tibet and China traveled through Kham, and Kham is said to be the inspiration for Shangri-La in James Hilton's novel. Settled as Tibet's eastern frontier in the 7th century, King Songtsen Gampo built temples along its eastern border. In 1939, an eastern area of Kham was officially established as Xikang Province of China. Geography Kham has a rugged terrain characterized by mountain ridges and gorges running from northwest to southeast, and collectively known as the Hengduan Mountains. Numerous rivers, including the Mekong, Yangtze, Yalong River, and the Salween River flow through Kham. Under the modern administrative division of China, Kham includes a total of 50 contemporary counties, which have been incorporated into the Chinese provinces of Sichuan (16 counties), Yunnan (three counties), and Qinghai (6 counties) as well as the eastern portion of the Tibet Autonomous Region (25 counties). Ethnic groups The people of Kham, the Khampas, are reputed warriors renowned for their marksmanship and horsemanship. References state many Khampas in the Hor States include mention of their Mongolian heritage. There are significant differences in traditions and beliefs—even physical appearance—between the peoples of Kham and Lhasa. Most of Kham's residents speak Khams Tibetan while at least one-third of the residents are speakers of Qiangic languages, a family of twelve distinct but interrelated languages that are not closely related to Khams Tibetan. As a frontier region, Kham integrated and "Tibetanized" early Mongolian and Chinese populations. After Güshri Khan's invasion of Kham in 1639, Mongolian people and Amdo's tribal people resettled to the region. The Khampas are known for their great height. Khampa males are on average . History 7th - 10th centuries The Pugyal Dynasty (or Yarlung) of the Tibetan Empire sent troops east from Lhasa to the reaches of the Tibetan Plateau, where they interacted with