Assan Barrage is a pristine blue-green lake located about 40 km from Dehradun. This man-made lake is a birdwatcher’s paradise and is located at the confluence of the Yamuna and Assan rivers. The lake offers wonderful boating opportunities. The best time to visit is in October, November, February, and March. The Assan Barrage is also called the Dhalipur Lake. The Assan Barrage was formed by the confluence of the two major rivers Assan and Yamuna in Uttarakhand. The area created by the confluence is now a place full of life, biodiversity, and the most unique bird population in the world.