Olympus Mons the height of Mauna Kea as measured from its base on the ocean floor). The total elevation change from the plains of Amazonis Planitia, over to the northwest, to the summit approaches . The summit of the mountain has six nested calderas (collapsed craters) forming an irregular depression × across and up to deep. The volcano's outer edge consists of an escarpment, or cliff, up to tall (although obscured by lava flows in places), a feature unique among the shield volcanoes of Mars. Olympus Mons covers an area of about , which is approximately the size of Italy, and it
Olympus Mountain Running The medical care is provided by rescue services. The fastest runners finishes the race in about four hours. Around 1970, inspired by mountain running in the Alps, the first thoughts of a marathon in Olympus came on. Younger members of the Mountaineering Association E.O.S. Thessaloniki implemented the idea; a running track was selected, the paths were cleaned and marked. The first run took place on July 6, 1986. Around 100 Greek runners participated; although starting numbers have been assigned, there are no statistics on the results of this first Olympus Marathon. The new sport was called "Mountaineer Marathon", not only