🇨🇳 China · Hydraulic works
Zhengguo Canal – Jingyang Irrigation Canal (Zheng Guo Qu)
Warring States to Han continuous · Qin with Han engineer Zheng Guo (鄭國)
246 BCE 'sabotage' canal that irrigated 27,000 ha and enabled Qin to unify China.
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3 places to sift through. Narrow by kind, country, period or how firmly each one is established — contested and pseudoarchaeological claims are labelled here, never hidden.
🇨🇳 China · Hydraulic works
Warring States to Han continuous · Qin with Han engineer Zheng Guo (鄭國)
246 BCE 'sabotage' canal that irrigated 27,000 ha and enabled Qin to unify China.
🇨🇳 China · Archaeological wonder
Ming Dynasty 1505 (Jiajing) rebuild over Northern Qi core · Ming Han Chinese
Best-preserved Ming Great Wall pass (1505) at 1,015 m Juyongguan defile north of Beijing, 7.8 m high crenellated brick-stone ramparts with 19 watchtowers, widened for five horses abreast and beacon…
🇨🇳 China · Archaeological wonder
Warring States to Han Dynasty 7th c BCE – 220 CE (early segments); Ming 1368–1644 (classic brick) · Han Chinese (Qin, Han dynasties)
World's longest wall system (21,196 km including branches) with earliest rammed-earth frontier walls from Warring States and Han (7th c BCE–2nd c CE) preserved in Gansu corridor (Han Dunhuang walls),…