Dan Xia World Geological Park - Photos by Robin Su, Zhangye, Gansu Province, China
It is in the west of Zhang Ye city about 40 km.The landform formed 6 million years ago ,which is composed of red gravel,malmstone and mudstone.Because of long time efflorescence and normal erosion ,many isolated mountain peaks and steep strange rocks formed from the verrucano .It is so colorful.Some area it looks like rainbow with seven colors,so this landform got its name from this.