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The 40 pages that link to Mount Everest, each with the reason it gives.

• HimalayasBroader topic: Its summit rock formed under an ocean, the clearest evidence of the collision.

• OvertourismBroader topic: Commercial climbing brings crowding, safety concerns, and waste-management challenges to a fragile site.

• Altitude sicknessBroader topic: Its extreme elevation exposes climbers to severe hypoxia and altitude-illness risks.

• High-altitude mountaineeringBroader topic: Its summit lies in the death zone, where prolonged exposure sharply raises risk.

• Alpine climbingBroader topic: High-altitude expeditions extend alpine climbing into extreme altitude and prolonged exposure.

• Eight-thousandersBroader topic: It is the highest of the fourteen and the best-known example.

• NepalBroader topic: Its climbing routes and trekking region draw visitors to Nepal’s Himalayas.

• Great Trigonometrical SurveyBroader topic: The survey calculated the height of Peak XV, later named Mount Everest.

• Reinhold MessnerBroader topic: Messner’s oxygen-free ascent helped establish that Everest could be climbed without bottled oxygen.

• Tenzing NorgayBroader topic: Its summit was the destination of Norgay’s best-known climb.

• Himalayan mountaineeringBroader topic: Everest has become the most prominent destination for Himalayan expeditions.

• Radhanath SikdarBroader topic: Peak XV, whose height Sikdar helped calculate, became Mount Everest.

• Bear GryllsBroader topic: Grylls climbed Everest in 1998, an early expedition that shaped his public profile.

• Ranulph FiennesBroader topic: Fiennes reached its summit in 2009, after recovering from a heart attack.