The site of Poggio ai Monti is situated in the upper Cecina valley, close to the town of Montecastelli (Montecatini Val di Cecina, Pisa). Its dominant position, facing Rocca di Sillano, is naturally defended by the deep canyon in which the Pavone torrent runs. From the summit it is possible to see Volterra, Pomarance, and further a field the Val d’Elsa, Monte Amiata and the Tyrrhenian sea. A survey was carried out on the site, identified during the course of the Cecina Valley project in 1998, which studied the surface distribution of the finds. These were constituted exclusively by pottery sherds belonging to the classes tile (flat tiles and semicircular imbrices) table-wares (chalices, bowls and plates in depurated and semi-depurated ware, some grey ware and occasional fragments of black glaze ware), cooking and kitchen wares (impasto pithoi, jars and mortaria). The frequency of the various classes analysed in relation to the conformation of the terrain suggests that, in a period between the 6th-4th century B.C. circa, the site was occupied by one or more buildings. The walls were of perishable materials and the structures were roofed with tiles and imbrices, their function being residential but also to control the territory. The presence of a cemetery area is not to be excluded.