 Albor Tholus is 4.5 kilometres high and has a diameter of 160 km at its base.Its large caldera, having a diameter of 30 km and a depth of 3 km, is deep compared to calderas on the Earth.The elevation of the lowest level of the caldera is the same as the base of the volcano; however, the original lower slopes of Albor Tholus may have been covered by lava flows from its larger neighbor, Elysium Mons.