Mountain Height Comparison

Mount Everest is the highest mountain above sea level at 5.5 miles (8.849 km). Measured from its base on the sea floor, Mauna Kea is taller at 6.34 miles (10.21 km), and Olympus Mons on Mars towers over both at 13.6 miles (21.9 km), about 2.5 times the height of Everest.

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