Nanda Devi is the second highest mountain in India (25645 ft.) and the highest entirely within the country (Kangchenjunga being on the border of India and Nepal); owing to this geography it was the highest known mountain in the world until computations on Dhaulagiri by western surveyors in 1808.
Nanda Devi is a two-peaked massif, forming a 2 kilometres (1.2 mile) long high ridge, oriented east-west. The west summit is higher, and the eastern summit is called Nanda Devi East. Together the peaks are referred to as the twin peaks of the goddess Nanda. The main summit stands guarded by a barrier ring comprising some of the highest mountains in the Indian Himalayas (one of which is Nanda Devi East), twelve of which exceed 6,400 m (21,000 ft) in height, further elevating its sacred status as the daughter of the Himalaya in Indian myth and folklore. The interior of this almost insurmountable ring is known as the Nanda Devi Sanctuary, and is protected as the Nanda Devi National Park. Nanda Devi East lies on the eastern edge of the ring (and of the Park), at the border of Chamoli, Pithoragarh and Bageshwar districts.