The Shipton–Tilman Nanda Devi expeditions took place in the 1930s. Nanda Devi is a Himalayan mountain in what was then the Garhwal District in northern India, just west of Nepal, and at one time it was thought to be the highest mountain in the world. It was only in 1950 that a higher summit was reached when Maurice Herzog and Louis Lachenal climbed Annapurna. Nanda Devi itself was climbed for the second time in 1964.