The island has a slightly oval shape and extends towards the south east at the Capo Graziano promontory; a small peninsula linked to the main part of Filicudi by a strip of land. The island is made up of the production of six volcanic centres.

The oldest must have been located in the sea, close to the Fili di Sciacca coast. The largest and oldest crater is the Fossa delle Felci, the most recent the Montagnola. South-east is the stagnant Cape Graziano dome which forms the promontory.