Nujiang 72 turn is located in Basu County, Tibet, also known as "99 Daowan in Sichuan-Tibet", the lowest point is 3,100 meters above sea level, and all the way to the highest point Yela Mountain Pass is 4,651 meters above sea level, and then circled to Bangda Town, 4,100 meters above sea level. It is about 12 kilometers long.