The colorful hilly landscape is controlled by the Zhonggou Formation strata of the Middle and Lower Cretaceous systems, and is distributed in a ring with interbedded thin layers of mudstone, sandy mudstone and shale. Purple-red, gray-green, yellow-green, gray-black and other variegated colors are densely distributed. The combination is orderly and full of rhythm and layering. Against the background of the setting sun, it looks like rainbow clouds falling on the hills. This scenic spot should be the most beautiful scenic spot in Zhangye Colorful Danxia Scenic Area. It is best enjoyed at sunset on a sunny day. We were lucky, it was just right when we first arrived, but unfortunately it turned cloudy after a while. Be sure to check the weather forecast before going. Below are photos of sunset and cloudy weather to compare, they are much different.