Photo taken on June 18, 2018 shows Jiangxiyan irrigation system in Longyou County, east China's Zhejiang Province. China's four ancient irrigation sites, which are Dujiangyan irrigation system, the Lingqu Canal, the Jiangxiyan irrigation system and the Changqu Canal, have been added to the World Heritage Irrigation Structures list by the International Commission on Irrigation and Drainage (ICID). (Xinhua/Rao Feng)