In the reduced size screen shot above, Olympus Mons is the large white volcano above and to the left of the three volcanoes in a row. It is the largest know volcano in our solar system at 374 miles in diameter (approximately the size of Arizona). It is 16 miles high with a caldera at the summit measuring 50 miles wide. NASA has more info on Olympus Mons here.

Have fun exploring.

Googe Earth, Olympus Mons closeup
Google Earth, Olympus Mons closeup, NASA JPL

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