Between the 17th and 18th of January 2007 a geophysical survey was conducted on behalf of the Studio Cempella at the request of the Soprintendenza di Etruria Meridionale and undertaken by a joint team from the Archaeological Prospection Services of Southampton (APSS) and The British School at Rome. This one hectare magnetometer survey at Bolsena presented a series of problems for clearly identifying archaeological features: the space was limited by highly magnetic structures and surface material, which also created high readings, making more ephemeral features difficult to identify. From the results obtained, there are no striking archaeological features, rather there are just fragmentary features whose form is very difficult to make any detailed interpretation of. There is no visible trace of the Via Cassia, which was suggested might pass close to the site. Geological factors may have also added to the ephemeral nature of the archaeology; erosion and deposition may mean that the archaeological features are more obscured by topsoil that runs deeper than the machines are able to penetrate. In conclusion, the presence of archaeological features cannot be entirely discounted. Rather, the nature of the modern site, geology, and archaeology have meant that in this magnetometer survey nothing can be confidently identified in detail, with a specified form.