The ancient acropolis is situated on a hill, on the southern side of the Porto-Cheli bay.

Its northern section is submerged. Its walls (186m long and 2,50m wide), reinforced with square and sircular towers, had poros foundations, and a superstructure of bricks and tiles over conglomerate. The cult centre (deposits of the 6th and 5th centuries B.C., altar of the 4th century B.C.), houses and workshops have been revealed in the precinct of the acropolis.