The Lake Vouliagmeni (Sunken Lake) is a unique oasis in an unusual landscape fairly close to Athens.

It is situated immediately to the south of town and very close to the sea. Overall one can describe it as a small brackish water lake fed by underground currents seeping through the mass of Mount Hymettus. It was once a large cavern that collapsed following an earthquake, probably during the early Middle Ages. The outline of the collapsed cavern roof can be clearly discerned from a distance. The lake stands at a 40 cm elevation, and its water maintains a constant 24 degrees Celsius temperature year round and functions as a spa.

You can swim in it, enjoy the spa treatment, have a cup of coffee in the nearby restaurant or just stroll around the lake and enjoy the beautiful view.