Dujiangyan, located on the Minjiang River in the west of Chengdu Plain, about 50km away from Chengdu City, was built in the third century BC. Its uniqueness is that it does not need dikes to regulate water flow. For more than 2000 years, it has been playing an effective role in flood control and irrigation, making Chengdu Plain a fertile land free from drought and flood and one of the most important grain producing areas in China. As the oldest water conservancy project in the world which is still in use and has no dike to control water, the Dujiangyan engineering reflects the wisdom of harmonious coexistence between Chinese people and nature.
