It is... but only if you're measuring from sea level. In terms of elevation, Everest tops out at 29,032 feet (8,849m), making it the highest point above sea level. However, if you're measuring from base to summit, then Mauna Kea in Hawaii is technically taller. Rising over 33,500 feet (10,210m) from its base on the ocean floor, only about 13,800 feet (4,207m) are visible above sea level.

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