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Tagsqinchuan
1 place carries this tag, across every kind and continent it appears in.
🇨🇳 China · Hydraulic works
Warring States (Qin to Han) · Qin Sichuan, Bashu
Min River Fish-Mouth levee splitting Waijiang north flood vs Neijiang south irrigation with Lidui cut, 256 BCE Li Bing.