Pavlopetri 

     The city of Pavlopetri (Greek: Παυλοπέτρι), underwater off the coast of southern Laconia in Peloponnese, Greece, is about 5,000 years old, and is the oldest submerged archeological town site and is located between the Pavlopetri islet across the Elafonisos island and the Punta coast.

 Elafonisos

  Elafonisos belongs in the Prefecture of Lakonia, and 3,7 naval miles eastern is the city of Neapolis, in south-eastern tip of Peloponnese.