Dachaidan Devil City. From Dachaidan all the way west, to the legendary Yadan Devil City. The Yadan Landform Devil City is located on the northern edge of the Qaidam Basin on the Qinghai-Tibet Plateau. It is a combination of long strips of mounds and grooves that are intermittently extended. It is called Yadan Landform by geologists. This piece of Yadan is also very beautiful and magnificent, and because it is widely distributed on both sides of the road, it is not commercialized, very original ecology, although the devil city is on both sides of the road, but it is also no man's land, very desolate, from a distance, one mound is strange, one person walks in, It still feels very scary. Dachaidan small town, the small town on the plateau, is very quiet and beautiful. Standing in the small city, you can see the snowy mountains not far away. In July, the top of the mountain is still snowy.