The stratovolcano extends from north to south and has the shape of an ellipse with a size of 47 x 38 km (29.2 x 23.6 mi).

On the eastern slope is the caldera Valle del Bove with steep walls up to 1,000 m (3,281 ft) deep in the shape of a 5 x 10 km (3.1 x 6.2 mi) horseshoe.