Myos Hormos — Eastern Reef Channel Harbour at Marsa Nakari
Marsa Nakari Reef Channel · Myos Hormos Outer Channel
Mid-Holocene reef to Late Roman·Roman Egyptian·🇪🇬 Red Sea Governorate, Marsa Nakari fringing reef eastern channel breach, outer reef face, Egypt
About
About Myos Hormos — Eastern Reef Channel Harbour at Marsa Nakari
/natural channel through the fossil reef at 2–5 m depth, lined with Roman concrete (pozzolana) cutwater 18 m long on the northern wall and a mooring pier 12 m on the southern wall. The channel allowed Mediterranean hulls drawing 3 m to enter the lagoon from the open Red Sea despite 1-m tidal range. The reef flat carries Indo-Roman ballast (basalt from Arabian coast) and a wreck field (Periplus-era? Dressel 2–4 shatter) at 5 m. 2 m dates 4200 BCE (coral radiocarbon), providing Red Sea sea-level index.
2 m at low tide by coral growth (+1 mm/yr) after 500 CE abandonment, now impassable to yachts except at spring high.
Why it mattersOnly Roman reef-channel harbour with preserved pozzolana in Red Sea; coral reef sea-level and growth calibration point.
Open questions
Mysteries & theories
Mysteries
- 01Whether channel is fully artificial or natural reef blow-hole enhanced
- 02Wreck field — single cargo or multiple strandings
Theories
- 01Channel engineered to 3 m draft for Alexandrian grain ships; Indian dhows used separate shallow mangrove passage
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- Natural reef breach; enhanced 30 BCE–14 CE with concrete
- Period
- Mid-Holocene reef to Late Roman
- Culture
- Roman Egyptian
- Builders
- Roman harbour engineers (Augustan)
- Purpose
- Reef channel allowing Mediterranean ships into lagoon harbour
- Abandoned
- 500 CE coral growth and lagoon silt closed channel
- Rediscovered
- Reef channel known to divers; concrete recorded 2016 Sidebotham
- Excavation
- Partially excavated
c.4200 BCE
Fringing reef at -4.2 m dated by coral
30 BCE–14 CE
Channel cutwater and pier in Roman concrete
c.50–250 CE
Indo-Roman peak use (Periplus)
2016
Concrete cutwater measured 18 m at channel breach
On the ground
Structures & features
25.0198° N · 34.8125° E · -3 m · 3 mapped features
Reef Channel Cut (22 m)
canal22 m wide channel through fringing reef at 3 m depth
25.0199° N · 34.8128° ERoman Concrete Cutwater
harbour18 m pozzolana cutwater on northern channel wall
25.0200° N · 34.8123° EWreck Field Dressel Scatter
shipwreckShatter of Dressel 2–4 amphorae wreck at 5 m west of channel
25.0196° N · 34.8120° E