The Asan Conservation Reserve is located in Uttarakhand.

Explanation:
The Asan Conservation Reserve is a protected area located in the Dehradun district of Uttarakhand, India. It is situated near the Asan Barrage, which is a man-made wetland on the Asan River. The reserve covers an area of approximately 4.5 square kilometers.

Key Point 1: Location
- The Asan Conservation Reserve is situated in the state of Uttarakhand.
- It is located in the Dehradun district of Uttarakhand.

Key Point 2: Significance
- The Asan Conservation Reserve is an important habitat for a variety of flora and fauna.
- It is particularly known for its rich birdlife, with over 300 species of resident and migratory birds.
- The reserve is an important stopover for migratory birds that travel along the Central Asian Flyway.
- It also supports a diverse range of other wildlife, including mammals, reptiles, and amphibians.

Key Point 3: Conservation Efforts
- The Asan Conservation Reserve was established in 2005 with the aim of protecting and conserving its unique ecosystems and biodiversity.
- The reserve is managed by the Forest Department of the Government of Uttarakhand.
- Various conservation measures have been implemented in the reserve, including habitat restoration, anti-poaching efforts, and awareness programs.

Key Point 4: Visitor Facilities
- The Asan Conservation Reserve offers various facilities for visitors, including bird watching hides, nature trails, and interpretation centers.
- These facilities provide opportunities for visitors to observe and learn about the diverse wildlife and ecosystems of the reserve.

In conclusion, the Asan Conservation Reserve is located in Uttarakhand. It is a significant protected area known for its rich birdlife and diverse wildlife. The reserve is managed by the Forest Department of Uttarakhand and offers various visitor facilities for nature enthusiasts.