The 1955 French Makalu expedition was the first to successfully climb Makalu, the Himalayan mountain 12 miles (19 km) to the southeast of Mount Everest, on the border between Nepal and Tibet. At 8,485 metres (27,838 ft) Makalu is the fifth-highest mountain in the world and an eight-thousander.

The eight-thousanders are the 14 mountains recognised by the International Mountaineering and Climbing Federation (UIAA) as being more than 8,000 metres (26,247 ft) in height above sea level, and sufficiently independent of neighbouring peaks. There is no precise definition of the criteria used to assess independence, and at times, the UIAA has considered whether the list should be expanded to 20 mountain peaks by including the major satellite peaks of eight-thousanders. All of the eight-thousanders are located in the Himalayan and Karakoram mountain ranges in Asia, and their summits lie in an altitude known as the death zone.