The barrage is situated at the point where the Asan River and the Eastern Yamuna Canal meet. Located northwest of Dehradun, the wetland is close to the Uttarakhand-Himachal Border. Numerous waterfowl, including divers and waders, flock to the lake. There are birds in Asan that are categorised as endangered in the IUCN Red Data Book. At an elevation of 389.4 metres above sea level, the river bed is 287.5 metres long. Hundreds of migratory birds stop by the Asan barrage every year, making this a wonderful location for bird watchers, naturalists, and ornithologists. To casual birdwatchers, the winter months may be the most thrilling, but for the avid birder, the months of early May right up to the end of September provide fascinating possibilities to view the open-billed storks, painted storks, night herons, and more.