The Asan Barrage is a barrage in the Uttarakhand-Himachal Pradesh border region in Doon Valley,, northern India, situated at the confluence of the Eastern Yamuna Canal and the Asan River and about 11 km (7 mi) from Dakpathar, and 28 km. northwest of Dehradun in Uttarakhand. The barrage is 287.5m long and has water throughout the year which is fed from the river Asan and the discharge channel of the river Yamuna. Since 2020 it has been declared as Uttarakhand's first Ramsar site.

Dehradun, also known as Dehra Doon, is the 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 center of growth to help ease the migration and population explosion in the Delhi metropolitan area and to establish a smart city in the Himalayas. It is the third largest city in the Himalayas after Kathmandu and Srinagar.