The tallest mountain isn’t Everest
At 10,210 metres Mount Mauna Kea in Hawaii is the world’s tallest mountain. Mount Everest is 8,848m tall. Surveyors typically measure the height of a mountain from its base.
Mount Mauna’s base extends well below the level of the sea. It is nearly a mile taller than Mount Everest, according to the United States Geological Survey (USGS).