Ollagüe has two summits, Ollagüe South is high and Ollagüe North . The summit features a summit crater below the summit with a narrow opening towards the south, which forms the Quebrada El Azufre. The rim of the crater culminates into high Ollagüe South. The western rim is formed by several lava domes. These lava domes feature landslide deposits and lava flows that emanate from the foot of the dome. Originally they were considered to be a single lava dome, before it was found that the dome is formed by four individual domes. Just north of the summit crater lies another semicircular crater rim which encircles the summit crater on its northern side and whose high point is high Ollagüe North. The northeastern part of the edifice is old and affected by glaciation and the development of gullies, while the southwestern part has experienced younger activity and flank collapses. The volume of the well exposed edifice is about covering a surface area of . Ollagüe rises about above the surrounding terrain.