It stretches through a fertile valley crossed by two torrents, Sa Orta and Sa Cariasa, at the foot of Mount Benazzosu, one of the typical and evocative volcanic craters in the Meilogu sub-region of Logudoro, surrounded by other smaller elevations. Semestene is a quaint little village with medieval origins and 160 inhabitants, well-known for the ancient parish church of San Giorgio and, even more, the Romanesque church of San Nicola di Trullas, located two and a half kilometres from the residential area, in the open countryside, on the Campeda plateau. Where the sanctuary currently stands, there was originally a Roman villa from the imperial age, perhaps the centre of an important outpost.