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The Dujiangyan Irrigation System is a 2,270-year-old hydraulic engineering marvel that still irrigates over 5,300 square kilometers of farmland today. Built in 256 BC by governor Li Bing, it is the oldest surviving no-dam irrigation system in the world and a UNESCO World Heritage Site.
Governor Li Bing of the Qin State conceived the project in 256 BC to prevent flooding on the Chengdu Plain while providing irrigation. His ingenious design uses the natural topography and river flow, requiring no dam, and has operated continuously for over 2,200 years.