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(Creative Commons) It doesn't look that tall. The world's tallest mountain technically is not Mount Everest. . View gallery. Mount Everest is the tallest mountain above sea level, but if we're talking sheer height here, base to summit, then the tallest mountain is Mauna Kea on the island of Hawaii. Here's how it breaks down:
Standing 4,207 m (13,802 ft) above sea level, its peak is the highest point in the state of Hawaii. Much of the mountain is under water; when measured from its oceanic base, Mauna Kea is over 10,000 m (33,000 ft) tall and is the tallest mountain in the world. Mauna Kea is about a million years old, and has thus passed the most active shield stage of life hundreds of thousands of years ago.