|Elevation||7,074 m (23,209 ft)|
|Prominence||624 m (2,047 ft)|
|Location||Pithoragarh district, Uttarakhand, India|
|First ascent||1966, N. Mallik, S. Chakravorty, Tashi (Sherpa), Dorji (Sherpa)|
|Easiest route||East Face of Southeast Ridge to Southeast Ridge: snow/ice climb|
Tirsuli is a Himalayan mountain peak in the Pithoragarh district of Kumaon Uttarakhand, India. It is part of the complex of mountains, including Tirsuli West, Hardeol, Dunagiri, Changabang, and Kalanka, which make up the northeast wall of the Nanda Devi Sanctuary, in the Garhwal Himalaya. It rises at the northern end of the Johar Valley, which drains into the Ghori Ganga. This peak should not be confused with nearby Trisul, which is on the southwest side of the Sanctuary.
In 1939, a serious attempt on this peak by the successful Polish expedition to Nanda Devi East was abandoned after a night avalanche buried leader Adam Karpinski and climber Stefan Bernadzikiewicz at Camp 3. Indian team led by Mohan Singh Kohli from Indian Mountaineering Foundation, under Ministry of Defence, Government of India tried an unsuccessful attempt to the peak in 1964. Another team led by K. P. Sharma and organized by Himalyan Association attempted the peak in 1965, but turned back from about 18,000 ft (5,500 m). The peak was scaled for the first time on October 9, 1966 by another Indian team led by Chanchal Kumar Mitra. They ascended the east face of the south-east ridge and then took the south-east ridge to the top, mounting the summit bid from Camp 5, at about 21,860 ft (6,660 m). Nirapada Mallik and Shyamal Chakrabarty were the summitters. Other members of the team were Manik Banerjee, Marcopolo Srimal, Dr. Jungpangi from Geological Survey of India, and others. The expedition was organised by the Himalayan Association, Kolkata.
See also 
- Garhwal-Himalaya Ost (map, 1:150,000), Swiss Foundation of Alpine Research.
- This is an approximate figure. See Garhwal-Himalaya Ost (map, 1:150,000), Swiss Foundation for Alpine Research.
- The Alpine Club's Himalayan Index. The Indian Mountaineering Foundation quarterly Newsletter No.16 gives a slightly different figure.
- Jill Neate, High Asia: An illustrated history of the 7000 metre peaks, The Mountaineers, 1989, 0-89886-238-8, p. 89.
- Himalayan Journal Vol. 12, p. 65.
- Himalayan Association Journal, Vol. 2.
- Joydeep Sircar, Himalayan handbook, Calcutta, 1979.
- Himalayan Mountaineering Journal, Vol. 1, No.2, p. 73.
- Himalayan Journal 27, p. 67.
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