Kangchenjunga in the context of "Sikkim"

The Himalayas, or Himalaya, is a mountain range in Asia separating the plains of the Indian subcontinent from the Tibetan Plateau. The range has some of the Earth's highest peaks, including the highest, Mount Everest. More than 100 peaks exceeding elevations of 7,200 m (23,600 ft) above sea level lie in the Himalayas.

The Himalayas abut on or cross territories of six countries: Nepal, India, China, Bhutan, Pakistan and Afghanistan. The sovereignty of the range in the Kashmir region is disputed among India, Pakistan, and China. The Himalayan range is bordered on the northwest by the Karakoram and Hindu Kush ranges, on the north by the Tibetan Plateau, and on the south by the Indo-Gangetic Plain. Some of the world's major rivers, the Indus, the Ganges, and the Tsangpo–Brahmaputra, rise in the vicinity of the Himalayas, and their combined drainage basin is home to some 600 million people; 53 million people live in the Himalayas. The Himalayas have profoundly shaped the cultures of South Asia and Tibet. Many Himalayan peaks are sacred in Hinduism and Buddhism. The summits of several—Kangchenjunga (from the Indian side), Gangkhar Puensum, Machapuchare, Nanda Devi, and Kailash in the Tibetan Transhimalaya—are off-limits to climbers.

Nanda Devi is the second-highest mountain in India, after Kangchenjunga, and the highest located entirely within the country. (Kangchenjunga is on the border of India and Nepal.) Nanda Devi is the 23rd-highest peak in the world and ranked 74th by prominence in Chamoli Garhwal district of Uttarakhand, in northern India.

Nanda Devi was considered the highest mountain in the world before computations in 1808 proved Dhaulagiri to be higher. It was also the highest mountain in India until 1975, when Sikkim, an independent kingdom until 1948 and a protectorate of India thereafter, became a state of India. It is located in the Chamoli district of Uttarakhand, between the Rishiganga valley on the west and the Goriganga valley on the east.

The eight-thousanders are 14 mountains recognized by the International Mountaineering and Climbing Federation (UIAA) with summits that exceed 8,000 metres (26,247 ft) in elevation above sea level and are sufficiently independent of neighbouring peaks as measured by topographic prominence. There is no formally agreed-upon definition of prominence, however, and at times the UIAA has considered whether the list of 8,000-metre peaks should be expanded to 20 peaks by including the major satellite peaks of the canonical 14 eight-thousanders. All of the Earth's eight-thousanders are located in the Himalayan and Karakoram mountain ranges in Asia, and their summits lie in the altitude range known as the death zone, where atmospheric oxygen pressure is insufficient to sustain human life for extended periods of time.

From 1950 to 1964, all 14 of the eight-thousanders were first summited by expedition climbers in the summer season (the first to be summited was Annapurna I in 1950, and the last was Shishapangma in 1964); from 1980 to 2021, all 14 were summited in the winter season (the first to be summited in winter was Mount Everest in 1980, and the last was K2 in 2021). As measured by a variety of statistical techniques, the deadliest eight-thousander is Annapurna I, with one death (climber or climber support) for every three summiters, followed by K2 and Nanga Parbat (each with one death for every four to five summiters), and then Dhaulagiri and Kangchenjunga (each with one death for every six to seven summiters).

The Great Trigonometrical Survey of India was a project that aimed to carry out a survey across the Indian subcontinent with scientific precision. It was begun in 1802 by the British infantry officer William Lambton, under the auspices of the East India Company. Under the leadership of his successor, George Everest, the project was made the responsibility of the Survey of India. Everest was succeeded by Andrew Scott Waugh, and after 1861, the project was led by James Walker, who oversaw its completion in 1871.

Among the many accomplishments of the Survey were the demarcation of the British territories in the subcontinent and the measurement of the height of the Himalayan giants: Everest, K2, and Kangchenjunga. The Survey had an enormous scientific impact as well. It was responsible for one of the first accurate measurements of a section of an arc of longitude, and for measurements of the geodesic anomaly, which led to the development of the theories of isostasy.

Lhotse (Nepali: ल्होत्से, romanized: L'hōtsē [lotse]; Standard Tibetan: ལྷོ་རྩེ, romanized: lho tse, lit. 'South Peak' [l̥otse]; Chinese: 洛子峰) is the fourth-highest mountain on Earth, after Mount Everest, K2, and Kangchenjunga. At an elevation of 8,516 metres (27,940 ft) above sea level, the main summit is on the border between the Tibet Autonomous Region of China and the Khumbu region of Nepal.

With Everest to the north and Nuptse to the west, Lhotse forms the apex of the massive horseshoe-shaped arc of the Everest massif. Despite the tremendous vertical relief of its South and Northeast Faces, it is the least prominent of the eight-thousanders due to the great height of the South Col between it and Everest. Lhotse's Western Face, recessed behind the head of the Khumbu Glacier in the Western Cwm, plays an integral part in the standard routes of ascent for both peaks. The name Lhotse, which means "South Peak" in Tibetan, further emphasizes the close relationship between the two.