Akko (Acre) – Ptolemais Submerged Crusader Harbour
Ptolemais · Acre · Saint-Jean d'Acre
Middle Bronze to Ottoman (c. 2000 BCE – 1917 CE)·Canaanite / Phoenician / Hellenistic / Roman / Crusader / Ottoman·🇮🇱 Northern District, Akko, Israel
About
About Akko (Acre) – Ptolemais Submerged Crusader Harbour
Akko–Ptolemais – the Levant's best-preserved Crusader port (UNESCO), Hellenistic Ptolemais, Roman Colonia, Crusader Saint-Jean d'Acre and Ottoman Acre. Its double harbour: the eastern 'Harbor of the Chain' (Mina al-Sultan) and the southern 'Pisan Harbour' now lie partially submerged 1–4 m after 1.5 m medieval sea-level rise + 1202/1759 earthquakes. Marine survey (Galili & Sharvit, IAA) mapped the Hellenistic mole (ashlar header mole 100 m at –3 m), Crusader tower of Flies (islet mole), and Ottoman jetty chain boom sockets. The harbour basin retains Crusader ashlar quay 60 m at –1.5 m with Genoese pottery. UNESCO-listed sea walls overlie the submerged mole.
Why it mattersOnly Crusader double harbour preserving intact Hellenistic to Ottoman mole stratigraphy underwater; UNESCO Outstanding Universal Value criterion iv (Crusader harbour morphology).
Open questions
Mysteries & theories
Mysteries
- 01Function of Tower of Flies as lighthouse vs defensive islet mole
- 02Chronology of Hellenistic vs Roman mole repairs
Theories
- 01Harbour chain boom sockets preserve Crusader harbour defence technology
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- Harbour MB; Hellenistic mole 3rd c. BCE; Crusader harbour 12th c.
- Period
- Middle Bronze to Ottoman (c. 2000 BCE – 1917 CE)
- Culture
- Canaanite / Phoenician / Hellenistic / Roman / Crusader / Ottoman
- Purpose
- Grain, spice and pilgrim port for Crusader Kingdom; Napoleon's failed siege 1799
- Abandoned
- 1799 siege + 1759 earthquake
- Rediscovered
- Galili & Sharvit marine survey 1990s–; UNESCO 2001
- Excavation
- Submerged
Harbour MB; Hellenistic mole 3rd c. BCE; Crusader harbour 12th c.
Initial construction
c. 1146 CE
Rediscovery
On the ground
Structures & features
32.9230° N · 35.0710° E · -2 m · 3 mapped features
Hellenistic Mole (100 m)
moleHellenistic header mole 100 m at –3 m forming eastern harbour arm
32.9235° N · 35.0705° ECrusader Quay (Chain Harbour)
harbourCrusader ashlar quay 60 m at –1.5 m in Chain Harbour basin with chain sockets
32.9225° N · 35.0715° ETower of Flies Islet Mole
towerIslet mole with Crusader Tower of Flies lighthouse at harbour entrance
32.9240° N · 35.0695° E