Incapillo is a caldera with a diameter of at an elevation of . The three adjacent volcanic centres of Monte Pissis (), Cerro Bonete Grande (), and Cerro Bonete Chico () are also considered part of this volcanic complex and are among the highest on Earth. These centres surround the ignimbrite and lava domes. The walls of the caldera are high. A uniform ignimbrite, called the Incapillo ignimbrite, is rich in pumice and forms the bulk of the caldera walls.