Dehradun district in the context of "Rishikesh"

Dehradun (Hindi: Dēhrādūn, pronounced [ˈd̪ɛɦɾaːd̪uːn]), also known as Dehra Doon (/ˈdɛərə ˌduːn/ DAIR-ə DOON), is the winter capital and the most populous city of the Indian state of Uttarakhand. It is the administrative headquarters of the eponymous district and is governed by the Dehradun Municipal Corporation, with the Uttarakhand Legislative Assembly holding its winter sessions in the city as its winter capital. Part of the Garhwal region, and housing the headquarters of its Divisional Commissioner, Dehradun is one of the "Counter Magnets" of the National Capital Region (NCR) being developed as an alternative centre of growth to help ease the migration and population explosion in the Delhi metropolitan area and to establish a smart city in the Himalayas.

Dehradun is located in the Doon Valley on the foothills of the Himalayas nestled between Song River, a tributary of Ganges on the east and the Asan River, a tributary of Yamuna on the west. The city is noted for its picturesque landscape and provides a gateway to the surrounding region.

Uttarkashi district is a district of Garhwal division of the Uttarakhand state in northern India, and has its headquarters at Uttarkashi city. It has six Tehsils namely Barkot, Dunda, Bhatwadi, Chinyalisaur, Purola and Mori.

The district contains the source of the Bhagirathi (traditionally considered the headstream of the Ganga) at Gangotri and Yamuna at Yamunotri, both of which are highly significant and popular pilgrimage sites. Uttarkashi town, which lies on the main road to Gangotri, is also considered an important Hindu pilgrimage centre, especially for Saivites. The district is bounded on the north by Kinnaur and Shimla districts of Himachal Pradesh, on the northeast by Tibet, China, on the east by Chamoli District, on the southeast by Rudraprayag district, on the south by Tehri Garhwal district, and on the west by Dehradun district.

The Song River in Dehradun district drains the central and eastern part of the Doon Valley, in the state of Uttarakhand, India. A tributary of Sooswa river, which in turn is a tributary of the Ganges, it originates as spring-fed stream in the southern slopes of the Radi Top of Mussoorie ridge of the Himalayan range and runs from Dhanaulti towards Narendranagar. As is common in hilly areas, there are several streams running south from the mountains that merge into one river that emerges from the hills a little after Sahastradhara.

Song is one of the largest rivers that drain the Doon Valley traversing 190 km (120 mi), and its tributaries includes, Kali Gad, Bindal River and Rispana River.