The Hengduan Mountains (simplified Chinese: 横断山脉; traditional Chinese: 橫斷山脈; pinyin: Héngduàn Shānmài) is a large mountainous region in southwest China (Latitude: 22°~32°05'N, Longitude: 97°~ 103°E), forming the south-eastern part of the Qinghai-Tibet Plateau, and adjacent from the west to the Sichuan Basin.