Photo taken on Dec. 1, 2020 shows a view of the Longshou Canal and Ancient Luohe River Irrigation District in northwest China's Shaanxi Province, one of the four ancient Chinese irrigation sites honored as World Heritage Irrigation Structures (WHIS). Four ancient Chinese irrigation sites were honored as World Heritage Irrigation Structures (WHIS) on Tuesday, according to the Ministry of Water Resources. Granted by the International Commission on Irrigation and Drainage (ICID), the inclusion of the four irrigation projects has brought the total number of Chinese irrigation projects on the list to 23. (Chinese National Committee on Irrigation and Drainage/Handout via Xinhua)