Dioscurias–Sebastopolis – Milesian Twin Harbour under Sukhumi Bay
Dioscurias · Sebastopolis · Sukhumi ancient harbour · Dioscurias-Sebastopolis
Archaic Greek to Byzantine (6th c. BCE – 6th c. CE)·Milesian Greek / Colchian / Roman·🇬🇪 Abkhazia, Sukhumi Bay and Sukhumi cape inlet, Georgia
About
About Dioscurias–Sebastopolis – Milesian Twin Harbour under Sukhumi Bay
Miletos' easternmost city 6th c. BCE Dioscurias at Sukhum Bay cusp, renamed Sebastopolis by Augustus after turning Black Sea port management to Roman Pontus. Roman fortress (II Legio later Byzantine) beside Classical Greek trading harbour with 400-m mole –5 to –9 m and second inner canal harbour –3 to –6 m now under Sukhumi promenade sea level. Dived 1950–95 (Lordkipanidze, Shervashidze, French GAU): Hellenistic tower base, amphora stacks, 4th-c. Christian basilica slabs, and Malevich-style breakwater. Subsidence +6 m since Antiquity (Abkhaz down-warp). Reported 1960 as 'Black Sea Atlantis' by Soviet press due to clear tower tops under snorkel.
Why it mattersEasternmost Milesian colony defining Greek penetration to Caucasus; dual mole-canal harbour exemplifies Milesian adaptation to low-energy Abkhaz bay vs Aegean harbours.
Open questions
Mysteries & theories
Mysteries
- 01Did Dioscurias have inland Mithridatic hill fort vs seabay alone?
- 02Inner canal harbour — Augustan vs Hadrianic cut?
Theories
- 01Mole amphora stacks date Hellenistic outer vs Roman inner — harbour functional shift c.130 CE
- 02Sukhumi Bay subsidence 6 m quantifies Abkhaz tectonic down-warp vs Sinope stable
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- 6th c. BCE Milesian founders; Sebastopolis Augustan refoundation
- Period
- Archaic Greek to Byzantine (6th c. BCE – 6th c. CE)
- Culture
- Milesian Greek / Colchian / Roman
- Purpose
- Twin harbour emporion for Colchis–Scythia grain, wax, iron, slaves
- Abandoned
- 6th c. CE Justinian harbour rebuild after Lazic War 550
- Rediscovered
- 1924 Soviet mapping; 1972 Lordkipanidze diving
- Excavation
- Submerged
c.600 BCE
Milesians found Dioscurias at Sukhum Bay easternmost harbour
63 BCE
Pompey annexes to Roman Pontus, Sebastopolis bridgehead
c. 130 CE
Hadrian's fortress and second canal harbour cut
550 CE
Justinian refortification after Lazic siege
1972–95
Soviet–Georgian diving maps mole and tower at –6 m
On the ground
Structures & features
43.0017° N · 41.0211° E · -6 m · 3 mapped features
Dioscurias outer mole end
harbour400 m mole head at –6 to –9 m in Sukhumi Bay
43.0017° N · 41.0211° EInner canal harbour Sukhumi promenade
canal180 m canal harbour under promenade –3 to –6 m
43.0035° N · 41.0180° ERoman fortress platform Sukhumi cape
fortressFortress podium under promenade with Byzan basilica
43.0025° N · 41.0220° E