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Dujiangyan (Dujiang yàn), located west of Dujiangyan City, Sichuan Province, is China since ancient construction and use of large water conservancy projects, known as "the originator of the World Water Culture" is a famous tourist destination in Sichuan. Usually considered, Dujiangyan Irrigation Project is Qin Shujun Li Bing and its sub-prefect to mobilize people in the first 256 years of construction, is the world's by far, the oldest age, only retention, diversion dam is characterized by ambitious water project, is national key cultural relics protection units.