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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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Hydraulic works matching “Northern State”

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.

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Verification

Pick several

Verified204 Widely accepted10 Contested0 Hypothetical5 Unverified0 Pseudoarchaeology0

Category

Hydraulic works219 Archaeological wonders110 Ancient cities57 Earthworks30 Dams26 Aqueducts20

Country

🇮🇷Iran34 🇵🇪Peru15 🇯🇴Jordan15 🇨🇳China14 🇾🇪Yemen13

Heritage

UNESCO World Heritage only

Excavation

Partially excavated91 Excavation ongoing79 Excavated36 Unexcavated10 Buried2

Tags

hydraulic83 unesco28 qanat21 aqueduct16 dam15 canal14 sasanian10 irrigation

3 places

Qanats

20

Temple complexes16

Ancient villages9

Roman engineerings6

Hypothetical sites5

All categories →

🇪🇬Egypt

13

🇮🇳India10

🇹🇷Turkey10

🇧🇴Bolivia8

🇸🇦Saudi Arabia7

🇩🇿Algeria6

🇮🇱Israel4

All countries →

Submerged

1

9

“Northern State”

Hydraulic works

🇸🇩 Sudan · Ancient city

Semna and Kumma Fortresses

Middle Kingdom to New Kingdom (1900–1070 BCE) · Ancient Egyptian occupier

Twin customs forts Semna–Kumma bracketing Second Cataract with Sesostris III's negro-ship decree.

🇸🇦 Saudi Arabia · Hydraulic works

Sadd al-Khanaq Dam – Hijaz (Khaibar Oasis northern dam)

Late Pre-Islamic to Early Islamic · Nabataean–Himyarite to Umayyad

110-m two-phase dam (320 BCE–750 CE) on Wadi al-Khanaq — Khaibar oasis northern reservoir.

✓VerifiedUNESCO

🇾🇪 Yemen · Hydraulic works

Sadd el-Arim Secondary Dam — Marib North Spillway

South Arabian (Sabaean to Himyaritic) · Sabaean Saba and Himyarite

Marib north secondary 750-m earthen with Almaqah sluice temple 50 musnad inscriptions, Sabaean 750 BCE spillway.