“Mount Everest is the tallest mountain on Earth”

The common belief that Mount Everest is the tallest mountain on Earth stems from the widely accepted practice of measuring a mountain's height from sea level. Everest, nestled in the Himalayas, undeniably boasts the highest altitude on the planet, with its peak reaching an impressive 8,848.86 meters (29,031.7 feet) above sea level. This measurement has been the standard for geographical comparisons for generations, leading to Everest's iconic status as the "Roof of the World."

However, the definition of "tallest" can be interpreted differently, revealing a fascinating geological truth. When measured from its true base to its summit, the Hawaiian volcano Mauna Kea surpasses Everest. A significant portion of Mauna Kea lies submerged beneath the Pacific Ocean; from its underwater base to its peak, the mountain measures approximately 10,210 meters (33,500 feet). This makes Mauna Kea considerably taller than Everest in total vertical extent.

People commonly believe the myth about Everest because its height above sea level is the most visible and easily comprehensible metric. The dramatic ascent to its visible summit, far above any other landmass, naturally captures public imagination and headlines. The vast, unseen portion of Mauna Kea, hidden beneath thousands of meters of ocean, often goes unacknowledged in popular discourse, allowing Everest to retain its celebrated, though technically incomplete, title.