Dehradun district is a district of Uttarakhand state in northern India. The district headquarters is Dehradun, which has also served as the provisional capital of Uttaranchal since its founding in 2000. The district has 6 tehsils, 6 community development blocks, 17 towns and 764 inhabited villages, and 18 unpopulated villages. As of 2011, it is the second most populous district of Uttarakhand , after Haridwar. Dehradun district also includes the prominent towns of Rishikesh, Mussoorie, Landour and Chakrata. The district stretches from the Ganges river in the east to the Yamuna river in the west, and from the Terai and Shivaliks in the south and south-east to the Great Himalaya in the north-west.