Kangchenjunga, also spelled Kanchenjunga, Kanchanjanghā and Khangchendzonga, is the third-highest mountain in the world. Its summit lies at in a section of the Himalayas, the Kangchenjunga Himal, which is bounded in the west by the Tamur River, in the north by the Lhonak River and Jongsang La, and in the east by the Teesta River. It lies in the border region between Nepal and Mangan district, Sikkim state of India, with three of the five peaks, namely Main, Central and South, directly on the border, and the peaks West and Kangbachen in Nepal's Taplejung District.
Until 1852, Kangchenjunga was assumed to be the highest mountain in the world, but calculations and measurements by the Great Trigonometrical Survey of India in 1849 showed that Mount Everest, known as Peak XV at the time, is actually higher. After allowing for further verification of all calculations, it was officially announced in 1856 that Kangchenjunga was the third-highest mountain.
The Kangchenjunga is a sacred mountain in Sikkim and was first climbed on 25 May 1955 by Joe Brown and George Band, who were part of the 1955 British Kangchenjunga expedition. They stopped just short of the true summit, keeping a promise given to Tashi Namgyal, the Chogyal of Sikkim, that the top of the mountain would remain inviolate. The Indian side of the mountain is off-limits to climbers. In 2016, the adjoining Khangchendzonga National Park was declared a UNESCO World Heritage Site.
Kangchenjunga is the official spelling adopted by Douglas Freshfield, Alexander Mitchell Kellas and the Royal Geographical Society that gives the best indication of the Tibetan pronunciation. Freshfield referred to the spelling used by the Indian Government since the late 19th century. Alternative spellings include Kanchenjunga, Khangchendzonga and Kangchendzönga.
The brothers Hermann, Adolf and Robert Schlagintweit explained the local name 'Kanchinjínga' meaning “The five treasures of the high snow” as originating from the Tibetan word "gangs" kaŋ meaning snow, ice; "chen" tɕen meaning great; "mzod" meaning treasure; "lnga" meaning five.