city, capital of Uttarakhand state, northern India. It lies in the west-central part of the state in the foothills of the Himalayas at an elevation of 2,200 feet (670 metres). Dehra Dun was founded in 1699, when the heretical Sikh Guru Ram Rai, driven out of the Punjab, built a temple there. During the 18th century the area succumbed to successive invaders, the last of whom were the Gurkhas. When the Gurkha War ended in 1816, the area was ceded to the British. Dehra Dun is now a hill resort and the terminus of a road and a rail line from the south. Tea processing is the main industry. Dehra Dun is also the headquarters of the Survey of India and of the forest department; it houses the Forest Research Institute, the Archaeological Survey Laboratory, the Indian Military Academy, Rashtriya Indian Military College, the Wadia Institute of Himalayan Geology, and several other educational and research institutions. Tourist destinations include botanical gardens, the Tapkeshwar temple, Robbers Cave (with natural pools for bathing), and the Sahasradhara Waterfalls.

In the surrounding area, peaks rise to 8,000 feet (2,500 metres). The section called the Dun is a valley between the Himalayan foothills and the Siwalik (Shiwalik) Range (Siwalik Range). Rice, wheat, millet, tea, and other crops are grown; and the locality produces valuable timber. Mussoorie, a hill station north of Dehra Dun city, is a popular summer resort. Rishikesh is an important pilgrimage centre. Pop. (2001) city, 426,674; urban agglom., 530,263.