A two-thousand-year-old dam-free irrigation miracle — the fish-mouth divider, the flying-sand weir, and the bottle-neck channel still irrigating the Chengdu Plain's Land of Abundance today.

Dujiangyan Sichuan

genius water-split headwork (鱼嘴) built of bamboo cages filled with cobbles, naturally dividing the Minjiang river without a dam, surrounded by lush green hills, highlighting ecological water control