The Black Spring Reservoir is located on the Baoku River in Datong County, north of Xining City. Next to the G227 road, tourists usually pass by when they travel from Xining to Menyuan. The reservoir is built on the mountain. There is a feeling of Gaoxia out of Pinghu. The water surface is wide, the lake is green, the surrounding grasslands and trees are lush, and the environment is very beautiful. Autumn is a good time for tourists to take pictures, when the surrounding trees turn yellow and the scenery is warm. Every time there is a clear sky, the lake is quiet, and the water reflects the blue sky and the surrounding mountains. It is a beautiful blockbuster.