Pavlopetri

Pavlopetri is generally described as the oldest submerged town site yet found, occupied from around 3500 BC and sunk by earthquakes and rising seas by about 1000 BC. It lies in three to four metres of water between the Pounta shore and Elafonisos, and because the water is exceptionally clear and shallow, the plan is legible from the surface: streets, courtyards, house foundations, and rock-cut chamber tombs, spread over some nine acres. Underwater surveys mapped it in detail with sonar and produced a full digital reconstruction. There is no museum, no boardwalk and no guide on site; you swim out from the beach with a mask and look down. Boat anchoring damages the site, and it has appeared on watch lists of threatened underwater heritage.

What you actually see

• The street plan - lines of walls and lanes visible through the water.
• The house foundations - rectangular outlines of Bronze Age buildings.
• The tombs - rock-cut graves near the shoreline.
• The clear shallows - three to four metres of transparent water over the site.

When to go

Calm summer days, when there is no swell to stir the sand; morning light is best for seeing down. Wind from the south makes the water murky and the swim unpleasant.

Honest expectations

You need a mask and reasonable swimming ability, and the site can be hard to identify at first: it looks like faint stone lines on a sandy floor. Nothing is signposted, nothing is raised. Do not stand on the walls or anchor above them.

Nearby

Elafonisos and its beaches are across the strait; Monemvasia is an hour north.