The caldera is about 10 km across, and in places the walls tower 2000 m over the caldera floor. The highest point is the Roque de los Muchachos on the northern wall, at 2426 m altitude, which can be reached by road. The Cumbrecita is at a lower point in the south-eastern part of the caldera's rim. In the south-west, the caldera opens to the sea, through a riverbed called the Barranco de las Angustias. The Cumbre Nueva is a ridge that starts at the caldera and continues to the south.