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An atlas of Earth’s mysterious places — megaliths, pyramids, lost and sunken cities — with the evidence shown plainly: what is verified, what is contested, and what is still unknown.

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© 2026 Mysteria. Exploring the ancient world.Map © OpenFreeMap · OpenMapTiles · OpenStreetMap contributors

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Flood controls · Mysteria

CategoriesFlood controls

Flood controls

Every place in the atlas labelled flood controls.

Places: 1
Countries: 1
World Heritage: 0

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Verified0 Widely accepted1 Contested0 Hypothetical0 Unverified0 Pseudoarchaeology0

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ctesiphon1 diyala1 khosrow1 nahrwan1 predecessor baghdad1 samarra1 sasanian1

1 place

≈Accepted

🇮🇶 Iraq · Hydraulic works

Nahrwan Canal — Sasanian Flood Canal of Ctesiphon (Nahrawan)

Sasanian to Early Abbasid (550–937 CE) · Sasanian Persian (Khosrow I) with Islamic early maintenance

6th-c. Sasanian 120-km 30-m flood-canal protecting Ctesiphon, intake at Dur-Kurigalzu 240-m regulator, 30k ha Diyala.