| Altitude | Above ~8,000 m (26,000 ft) |
| Why deadly | Too little oxygen to survive long |
| Climbers use | Supplemental oxygen, speed |
| Found on | The 14 eight-thousanders |
The death zone refers to altitudes above about 8,000 metres (26,000 ft), where the oxygen is too thin to sustain human life for long. The body deteriorates rather than acclimatizes, so climbers use supplemental oxygen and move fast. Prolonged time in the death zone leads to exhaustion, altitude illness, and death.
Why it’s lethal
Above the limit of acclimatization, the body declines steadily, and altitude illness strikes fast — so climbers use supplemental oxygen and limit their time during a summit bid.
Where it is
Only the 14 eight-thousanders rise into it.
Frequently asked questions
What is the death zone?
The death zone is the extreme altitude — above roughly 8,000 m — where atmospheric oxygen is so low that the human body cannot acclimatize and instead steadily deteriorates. Climbers can only spend a limited time there before exhaustion and altitude illness become deadly.
How high is the death zone?
It begins at about 8,000 metres (26,000 feet). Only 14 mountains on Earth — the 'eight-thousanders', including Everest and K2 — rise into the death zone, which is why the term is associated with the highest Himalayan and Karakoram peaks.
How long can you survive in the death zone?
Only a limited time — typically hours to a couple of days at most, even with supplemental oxygen, before the body's decline becomes critical. Climbers minimize time there, move quickly, and most use bottled oxygen to extend their margin.
Sources
- Extreme altitude physiology — Wilderness Medical Society