1802 Alexander von Humboldt Chimborazo World Altitude Record Expedition

Official Expedition Narrative & Archival Record

In June 1802, during their monumental exploration of the Spanish Americas, Prussian polymath Alexander von Humboldt, French botanist Aimé Bonpland, and Ecuadorian nobleman Carlos Montúfar arrived in Riobamba at the foot of Nevado Chimborazo (6,263 m). At the time, Chimborazo was universally regarded by European geographers as the highest mountain on Earth. On June 23, 1802, the party launched an audacious push up the volcano's southwestern slopes from a base camp on the high paramo. Dressed in simple woollen overcoats and leather shoes, without ropes, ice axes, or crampons, the climbers pressed upward along a knife-edge rock and ice rib flanking a steep ravine. As atmospheric pressure plummeted, the trio suffered severe nausea, dizziness, and hemorrhaging from their gums and lips. Despite bone-chilling mist, driving sleet, and terrifying exposure above yawning abysses, Humboldt continued to pause at regular intervals, carefully setting up delicate mercury barometers, thermometers, and cyanometers to record altitude and atmospheric properties. At approximately one o'clock in the afternoon, the climbers found their path blocked by an impassable transverse chasm—a bottomless rift in the volcanic rock and ice roughly four hundred feet wide. Barometric calculations placed their high point at 5,878 metres (19,286 feet). With freezing fog enveloping the ridge and frostbite threatening their extremities, Humboldt ordered a retreat. Although short of the summit, they had climbed higher than any human in recorded history, a world altitude record that stood until the 1830s. Humboldt synthesized the data into his revolutionary 'Tableau Physique des Andes', fundamentally establishing the sciences of biogeography and ecology.