China wind erosion is the most obvious Ya Dan landforms generally appear in the area is

The Ya Dan landform with the most obvious wind erosion in China generally appears in the northwest.

Ya Dan landform is a typical wind erosion landform. Due to the wind erosion of the plains in arid areas, the ground gradually forms fragmented concave ridges and grooves, and some landforms look like ancient castles. In addition, the erosion of temporary running water and lake water is also one of the important reasons for the formation of Ya Dan. Due to the unique conditions, the northwest of China is the main distribution area of "Ya Dan landform".

Lakes in arid areas often include repeated water inflow and water withdrawal in their formation history, thus developing overlying mudstone layers and sandy soil layers. Wind and running water can take away loose sandy soil layer, but it has limited effect on hard mudstone layer and gypsum cementation layer. However, the dense mudstone layer is not indestructible.

The expansion and contraction effect caused by severe temperature difference in desert area will eventually lead to the collapse of mudstone layer, and the exposed sandy soil layer will be carried away by wind and running water, and it will evolve into a groove shape, while the part still covered by mudstone layer will be relatively stable, forming a large or small strip mound, and the morphology of Ya Dan landform will gradually emerge.