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Picture by the Mars Global Surveyor Mars Orbiter of the Apollinaris Patera volcano ( map of Mars ).
Its caldera is 80 kilometers across. (Craters on volcanoes are called calderas). This beautiful picture is a false color image.
( Pictures of the Mars Global Surveyor )
Picture of Olympus Mons ( map of Mars ) on Mars by the Viking 1 Orbiter in 1978. Olympus Mons is about 600 km in diameter. The caldera on top of Olympus Mons (mons means mountain) is 24 kilometers above the surrounding plains on Mars.
A simulated 3D view of Olympus Mons by MOLA.
Image Credit: NASA/MOLA Science Team
More pictures of Olympus Mons in 3D
Picture of the Arsia Mons volcano ( map of Mars ) - a very large volcano. Arsia Mons is more than 9 kilometers high. The crater on the volcano is 110 kilometers across.
Here is a 3D perspective movie about Arsai Mons. (Just right click on this link to save this 2.5 MB AVI movie. You will be able to play it with your favourite multimedia player.)
Small map showing the locations of Arsia Mons, Olympus Mons and Vallis Marineris.
Image Credit: NASA/MOLA Science Team
