Photo taken on Dec. 7, 2017 shows the Gonghuwan wetland park in Wuxi, a city of Taihu Lake basin in east China's Jiangsu Province. China has made strides in rolling out a "river chief" system nationwide amid efforts to tackle water pollution. Since the top leadership decided to assign each waterway in the country a specific steward, more than 900,000 "river chiefs" have been appointed at each level of government nationwide. By the end of 2017, the river chief mechanism has been established in Taihu Lake basin. (Xinhua/Li He)