The World's Tallest Mountains — But It Depends How You Measure

Everest was measured at 8,848 meters for decades until a joint Chinese-Nepali survey in 2020 revised it to 8,848.86 meters — officially rounded to 8,849. The revision came partly from more precise GPS technology and partly from an agreement on whether to measure to the rock surface or include the snow cap on top. They went with the snow.

Edmund Hillary and Tenzing Norgay reached the summit first on May 29, 1953. Hillary's response upon returning to base camp was characteristically understated — he reportedly told fellow climber George Lowe, "Well, George, we knocked the bastard off." Tenzing's response was to offer Hillary biscuits and chocolates from his pack, which he'd been carrying for the summit.

Over 300 people have died on Everest. Because conditions make body recovery nearly impossible at extreme altitude, many remain on the mountain. Some are visible landmarks that other climbers pass on their way up.

K2 is widely considered the hardest and most dangerous of the eight-thousanders. For every four people who have reached its summit, roughly one has died trying. Compare that to Everest, where the death rate is around 1–2%. K2 has no easy route — every approach involves technical climbing, extreme avalanche exposure, and brutal weather that rolls in without warning.

The name "K2" comes from the 1856 survey notation — it was the second peak measured in the Karakoram range, and unlike most major peaks, it has no local name in common use because it's so remote that no settlement has ever had a clear view of it.

This one requires a quick explanation of Earth's shape. The planet isn't a perfect sphere — it bulges at the equator due to its rotation, meaning the equator is about 21 kilometers further from Earth's center than the poles are. Chimborazo sits almost directly on the equator in Ecuador, at about 1.5°S latitude. Everest sits at 28°N — further from the equatorial bulge.

Chimborazo is a dormant volcano. At 6,263 meters above sea level, it wouldn't crack the top 100 highest peaks by standard measurement. But the equatorial bulge math makes it the point on Earth's surface that's closest to the Moon, the Sun, and outer space. Charles Darwin visited Ecuador in 1835 and wrote about the mountain, though he didn't attempt to climb it.

Mauna Kea looks modest on a map of Hawaii — it's the big island's tallest peak at 4,205 meters, not remarkable by global standards. But the mountain doesn't start at sea level. It rises from the floor of the Pacific Ocean, about 6,000 meters below the surface. Measure from base to peak and Mauna Kea reaches 10,210 meters — roughly 1,400 meters taller than Everest.

The summit is also cold enough to snow — Mauna Kea has its own ski area, which remains one of the stranger things you can do in Hawaii. The drive from the beach to the snow-covered summit takes about two hours.

Annapurna was actually the first eight-thousander ever summited — a French expedition reached the top in 1950, three years before Everest. The mountaineers Maurice Herzog and Louis Lachenal made the summit but suffered severe frostbite on the descent. Herzog lost all his fingers and toes. He later wrote a book about the expedition that became one of the best-selling mountaineering books of all time.