It is the easternmost commune in Liguria, bordering Tuscany at the feet of the Apuan Alps. The communal territory include the frazione of Luni, one of the most important cities in the area in Roman and early medieval times.
The ancient town is surrounded by a line of walls with two entrances. In the central square is the Guinigi Tower, today the campanile of the church of St. Lawrence (17th century) but once connected to a now disappeared castle. Other sights include: