Dehradun is situated in the newly formed Himalayan state of Uttaranchal around 235 km from Delhi at the center of the Doon valley. The city has the Himalayas to its north, the Shivalik range to its south, the sacred Ganges to its east and the Yamuna to its west. Dehradun is the part of Garhwal Himalayan region, which was earlier known as Kedar Khand. Katyuris of Garhwal were the initial rulers of this region. Later, this stronghold of the Katyuri dynasty passed into the hands of the Sikhs and Mughals.
The Gorkhas of Nepal also ruled here for a long time till the British came into
the picture. Following a war between the Gorkhas and the British, the Treaty of
Sugauli was signed in 1816. With this, the British established their hold over
the entire Garhwal and Kumaon regions including Dehradun.