In 2000 geophysical research, conducted by the German Archaeological Institute in Rome (directed by M. Heinzelmann), led to the discovery of a small harbour to the west of the Navalia. A depression in the terrain had been noted here a long time ago, and in 1829 Luigi Canina drew a semicircular structure on his plan of Ostia, which was not based on excavations however.
The west part of regions I and III with new discoveries, resulting from the geophysical research
by the German Archaeological Institute in Rome. Numbers indicate trenches. Plan: Michael Heinzelmann.
The harbour basin, that is now filled with sand, was rectangular. The opening from the Tiber was c. 200 metres wide, the depth was c. 100 metres. Along the south side ran a road.