Olympus Mons: The Largest Mountain in the Solar System This colossal shield volcano on Mars is so enormous it redefines what a “mountain” can be.Rising roughly 22 km (about 72,000 feet) above the surrounding plains — with some measurements of local relief reaching 26 km — Olympus Mons towers nearly three times the height of Mount Everest. Its base stretches across 600 km (370 miles), roughly the size of the state of Arizona.Because of its incredible scale and the gentle slopes of a shield volcano, if you stood at its base, the summit would curve away beyond the Martian horizon. You literally couldn’t see the top from the ground.Formed by hundreds of millions of years of slow lava flows, enabled by Mars’ weaker gravity and lack of plate tectonics, this giant has no rival in our Solar System.A single mountain so vast it could swallow entire ranges on Earth — a humbling monument to the raw power of planetary geology. Mars continues to remind us how extraordinary our Solar System truly is.
NASA