The
peaceful lagoon of Vouliagmeni lies 16-km. northwest of Loutraki and was
caused by the subsidence of the ground to á kind of trench.
The
lagoon is 2 km. long and up to 1 km. wide.
Its depth is estimated at 40 m. Á channel of 6-m. width provides
an outlet to the sea. 
In ancient times, it was called Eschatiotis (meaning
the 'last' part of the promontory) or Corgopis (from the mother of
Megareus, who was drowned in its waters). No
trace has survived of the ancient Megarean colony of Aegeirus, which stood
to the north of the lagoon.
A
settlement dating back to the early Helladic I period was discovered by
the archaeologist J.M. Fossey about 30 m. west of the channel from the
lagoon into the Gulf of Corinth.
Another settlement, of early Helladic 11,
has come to light to the north-west, and 300 meters from this an ossuary
of the same period yielded the bones of 10 dead and some 500 vessels. It
can be concluded from the scattered finds of sherds that in the third and
second millennia BC, families of farmers and fishermen sparsely inhabited
the area.