Hengduan Mountains
The Hengduan Mountains cover much of western present-day Sichuan province as well as the northwestern portions of Yunnan, the easternmost section of the Tibet Autonomous Region, and touching upon parts of southern Qinghai. Additionally, some parts of eastern Kachin State in neighbouring Myanmar are considered part of the Hengduan group. The Hengduan Mountains are approximately long, stretching from 33°N to 25°N. Depending on extent of the definition, the Hengduan Mountains are also approximately wide under the narrowest definition, ranging from 98°E to 102°E. The area covered by these ranges roughly corresponds with the historical region known as Kham.