The results from excavations and an extensive campaign of geo-archaeological survey made it possible to delineate the layout and functions of the coastal landscape, clarifying, at least in part, the question of the site and morphology of the port of Neapolis.

Piazza Bovio together with piazza Municipio constituted sectors of a single large inlet delimited to the west by Castel Nuovo and to the east by the church of Santa Maria di Porto Salvo. The inlet covered at least the whole of piazza Municipio and at piazza Bovio formed a bight which represented the eastern edge of the basin. Both at piazza Municipio and piazza Bovio excavations confirmed that the entire investigated area of the stations was occupied by the sea. The ancient coastline ran, not too far off, on the inland side of the stations.

At Piazza Municipio and at piazza Bovio no modifications to the coastal profile seemed to be documented between the Greek and Roman periods. At piazza Bovio the earliest sea beds that produced pottery finds dated to the 4th century B.C. To date the deepest levels reached by the excavation in piazza Municipio area those of the 3rd-2nd century B.C. These were ditches circa 1.80-1.90m wide, often intersecting, of which the sides were identifiable both on the upper levels of the natural substratum and on the sands themselves. It was also possible to observe the narrow impressed grooves left by the tools used for the dredging operations. Of note the discovery on the sea bed of part of a cargo of hemispherical black glaze cups, dating to the mid 3rd century B.C., made of clay that can certainly came from the bay of Naples.