🇪🇬 Egypt · Submerged site
Myos Hormos — Eastern Reef Channel Harbour at Marsa Nakari
Mid-Holocene reef to Late Roman · Roman Egyptian
Outer reef channel of Myos Hormos — 22 m reef cut with Roman concrete at 2–5 m breach at Marsa Nakari.
🇩🇪 Germany · Hydraulic works
Eifel Aqueduct (Eifelwasserleitung) — Roman Aqueduct to Cologne
Roman Imperial (Flavian to Late Roman, 1st–3rd c CE) · Roman Gallo–German (Colonia Agrippina)
95-km Flavian Roman concrete aqueduct (c.80 CE) delivering 20,000 m³/day from Eifel springs to Cologne.