Established as a national park with effect from 6 November 1982 as per Notification No. 3912/14-3-35-80 of 6 September 1982, the intention having been declared under Notification No. 2130/14-3-35-80 of 18 August 1980. Dang (1961) provides an historical account of the exploration of the Nanda Devi Basin. The first recorded attempt to enter the sacred basin was by W. W. Graham in 1883, but he was unable to proceed beyond the gorge of the lower Rishi Ganga. Subsequent attempts by Dr T. G. Longstaff in 1870 and Hugh Ruttledge in 1926, 1927 and 1932 also met with failure. Finally, in 1934, Eric Shipton and H. W. Tilman pioneered a route to the 'Inner Sanctuary' by forcing a passage up the gorge of the upper Rishi Ganga. Later, in 1936, Tilman and N. E. Odell made the first ascent of Nanda Devi, reputedly the most outstanding mountaineering success of the pre-Second World War era. It was their accounts of this natural sanctuary that first drew attention to the spectacular mountain wilderness (Tilman, 1935; Shipton, 1936), following which the area was established as a game sanctuary on 7 January 1939 (Government Order No. 1493/XIV-28). Commonly referred to as 'Nanda Devi Sanctuary', the name was changed to Sanjay Gandhi National Park at the time of notification. This met with local opposition and the site was gazetted as Nanda Devi National Park. The park was inscribed on the World Heritage List in December 1988. The park constitutes the core zone of a much larger area (200,000ha), extending as far north as the Dhauli Ganga, that has been proposed as a biosphere reserve (Indian National MAB Committee, n.d.).