What is the dead zone on Mount Everest?

As a subject matter expert in mountaineering and high-altitude physiology, I can provide a detailed explanation of the term "death zone" as it relates to Mount Everest. The death zone on Mount Everest refers to the uppermost part of the mountain where the atmospheric pressure is so low that the human body cannot acclimatize to the conditions. This zone begins at approximately 8,000 meters (26,247 feet) above sea level. In this region, the air contains only a third of the oxygen found at sea level, which is insufficient to sustain human life for extended periods. Climbers who venture into the death zone are at a significantly higher risk of suffering from altitude sickness, which includes symptoms such as hallucinations, cognitive impairment, and physical weakness. The lack of oxygen can lead to a condition called hypoxia, which can be fatal if not addressed promptly. The extreme cold, combined with the risk of frostbite and the physical exertion required to climb at such high altitudes, further increases the danger. It is worth noting that most of the fatalities on Mount Everest have occurred in the death zone. The combination of these factors makes it a critical and perilous part of any Everest ascent.

The death zone is the name used by mountain climbers for high altitude where there is not enough oxygen for humans to breathe. This is usually above 8,000 metres (26,247 feet). Most of the 200+ climbers who have died on Mount Everest have died in the death zone.