Arcesseia
Polis · Karpathos Municipality
Ancient city
Poseidium or Poseidion (Ancient Greek: Ποσείδιον), also known as Potidaeum or Potidaion or Karpathou Ktoina, was a town of ancient Greece on the island of Karpathos, and served as the harbour of Karpathos. Its site is located near modern Pigadia i.e. Karpathos Town.