🇪🇬 Egypt · Archaeological wonder
Pharos Lighthouse of Alexandria
Hellenistic Ptolemaic 297–280 BCE · Greek (Ptolemaic Alexandria)
100-m Ptolemaic lighthouse wonder whose lantern guided ancient Mediterranean.
🇱🇾 Libya · Submerged site
Ptolemais – Sunken Harbour of the Cyrenaican Pentapolis, Tolmeita
Hellenistic to Early Islamic (247 BCE – 642 CE) · Greek Ptolemaic / Roman / Byzantine
Ptolemy III foundation 247 BCE — Pentapolis harbour drowned 2 m off Tolmeita with 100 m breakwater and 6,000 m³ cisterns.
🇧🇬 Bulgaria · Submerged site
Apollonia Pontica (Sozopol) – Submerged Necropolis & Anchorage
Archaic to Late Antiquity (610 BCE – 6th c. CE) · Milesian Greek / Thracian / Roman / Byzantine
610 BCE Milesian colony whose harbours are now –6 m and linked to the vanished island Kianida of Ptolemy's map.