Sejila Mountain: It belongs to the Nianqing Tanggula Mountains, which is the boundary between the eastern and central and western Nyingchi County in Tibet, and is the watershed between the Niyang River Basin and the Palong Zangbu River. The altitude is 4728 meters. The Mira Pass is 5013 meters above sea level, which is the highest point of the Sichuan River Highway.