The Mountains of Mars.

Volcanic activity on Mars has produced towering mountains. The largest one, Olympus Mons, is pictured here in this Viking Orbiter image. Olympus Mons is a shield volcano nearly 15 miles high and over 300 miles wide at its base. By comparison, Earth's largest volcano, Mauna Loa in Hawaii, is just over 5 miles high and about 12 miles wide.

For more information about volcanic mountains on Mars see Calvin J. Hamilton's Mars page. The exploration of Mars is chronicled by the Center For Mars Exploration. The exploration of Mars is chronicled by the Center For Mars Exploration.