🇧🇬 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.