An indigo paper mountain and a green volcanic island beside a wooden measuring stick on an ivory desk
AI-generated conceptual illustration created for BrainiLab; the paper models are not named mountain profiles or a scale diagram.

Everest starts at sea level

Mount Everest is 8,848.86 metres above sea level, according to the height jointly announced by China and Nepal in 2020. The International Association of Geodesy explains that measurement.

That makes Everest Earth’s highest mountain above sea level. But ask which mountain is tallest, and someone may nominate a volcano in Hawaii. Nobody needs a new ruler. They need to agree where it starts.

Mauna Kea has a hidden head start

Much of Mauna Kea is underwater. Measure from its base on the ocean floor to its summit and the mountain rises more than 10,210 metres, according to NOAA’s comparison of mountain heights.

Everest wins the sea-level comparison; Mauna Kea is taller from base to summit. Imagine two people on different staircases: head height and distance climbed are different questions.

Chimborazo takes a different route

Earth bulges around the Equator. Ecuador’s Mount Chimborazo sits close to that bulge, so its summit is farther from Earth’s centre than Everest’s.

It is not higher above sea level. Its starting point is simply farther out. The shape of Earth quietly changes the contest.

Pick a starting line

For a quick quiz, “highest above sea level” means Everest. Base to summit points to Mauna Kea; distance from Earth’s centre points to Chimborazo.

Geography loves a hidden definition. It also explains why Greenland looks enormous on some maps and why the Caspian Sea can be called a lake.