The “Death Zone” refers to altitudes above 8,000 meters on high mountains like Mount Everest (Sagarmatha), where oxygen levels are insufficient to sustain human life for long. In this extreme environment, the body cannot fully acclimatize, and climbers face severe risks such as oxygen deprivation, frostbite, altitude sickness, and exhaustion. https://highrouteadventure.com/death-zone-everest/