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Tagsdam-less
1 place carries this tag, across every kind and continent it appears in.
🇨🇳 China · Hydraulic works
Warring States, Qin to Qing continuous · Qin state engineers under Li Bing (later successive dynasties maintenance)
256 BCE Qin weir still irrigating 5,300 km²—world's oldest dam-less hydraulic system.