Mount Kanchenjunga Main is the third highest mountain peak in the world. It has an elevation of 8,586 m (28,169 ft) in a section of the Himalayas called  the Kangchenjunga mountain range  delimited in the west by the   Tamur River , in the north by Jongsang La and Nepal-China border. Kanchenjunga Main is on the border of Phaktanglung and Sirijanga rural municipality in Taplejung district and India. Kanchenjunga Main is 1.1 km east southeast from Yalung Khang and 0.8 km north northwest from Kanchenjunga Central. Until 1852, Kangchenjunga was  assumed to be the highest mountain in the world, but calculations based on various readings and measurements made by the  Great Trigonometrical Survey of India in 1849 came to the conclusion that  Mount Everest, known as Peak XV at that time, was the highest. Allowing for further verification of all calculations, it was officially announced in 1856 that Kangchenjunga was the third highest mountain in the world. Kangchenjunga was first successfully climbed on 25 May, 1955 by Joe Brown and George Band, who were part of a British  expedition . They stopped short of the summit in accordance with the promise given to the  Chogyal that the top of the mountain would remain intact. Every climber or climbing group that has reached the summit has followed this tradition.