Dujiangyan Irrigation System

Originally constructed in 256 BC, the Dujiangyan Irrigation System stands as the world’s oldest non-dam irrigation facility. Located near Chengdu, China, this UNESCO World Heritage Site harnesses the natural topography and hydrological features of the river to irrigate over 1.65 million acres (668,700 hectares) of farmland. Visitors can explore the intricate network of channels and weirs, marveling at the ancient engineering that has sustained the region for over two millennia. The site offers a glimpse into the ingenuity of early Chinese engineers and the enduring impact of their work on the local landscape.