In pics: Ulunggur Lake in Fuhai County, NW China

Staff members of the local water conservancy bureau test the water quality of the Ulunggur Lake in Fuhai County, northwest China's Xinjiang Uygur Autonomous Region, April 3, 2018. Fuhai has made strides in rolling out a "river (lake) chief" system amid efforts to guarantee water quality, customizing measures for each river and lake. (Xinhua/Hu Huhu)