World’s tallest mountain
The catch: it’s a dormant shield volcano on the island of Hawaii with its base about 6,000 meters (19,700 feet) below the surface of the Pacific Ocean. In other words, more than half of it is submerged. When you add everything up, Mauna Kea is over 10,000 meters tall, way taller than the 8,850 meters of Mount Everest — making it the world’s tallest mountain. It’s also the tallest volcano on Earth.