In Haixi Mongolian and Tibetan Autonomous Prefecture. According to the records of Xining Dibao, Chaerhan Salt Lake is famous as "Zhang Wan Salt Bridge" and is a wonder of the world. Located at the exit of Liu Ge Expressway in Golmud City, Haixi Mongolian and Tibetan Autonomous Prefecture, Qinghai Province, it is 2670 meters above sea level and is the bottom of the Qaidam Basin. It is 60 kilometers away from Golmud City in the south, 0/10 kilometers away from Dachaidan in the north and 20-40 kilometers wide from north to south. Many buildings in Chaerhan Salt Lake are built with salt. Among all kinds of salt buildings, the most famous one is "Zhang Wan Salt Bridge", which is a world miracle.