Khosrov State Reserve, Nature reserve in Ararat Province, Armenia

Khosrov State Reserve is a nature reserve in Ararat Province, Armenia, covering mountainous terrain with juniper and oak forests. The elevations range from 700 to 2,800 meters (2,300 to 9,200 feet), allowing for different climate zones and plant communities.

King Khosrov III founded the protected area between 334 and 338 as a royal hunting ground. This early designation makes it one of the oldest nature reserves in the world.

The reserve takes its name from King Khosrov III Kotak, who had forests planted from Garni fortress to Dvin in the 330s–338. According to Movses Khorenatsi, one section was called Tachar Mairi and another Khosrovakert, which reached the Yeraskh; only fragments of Tachar Mairi survive, merged into the natural forest.

Entry requires a permit from the Armenian Ministry of Nature Protection, and visitors must follow strict environmental rules. Sturdy footwear and enough water are essential because of the mountainous terrain and altitude differences.

Over 1,800 plant species grow here, representing about half of all flora in Armenia. This diversity comes from the wide elevation range and varied soils, which shelter many rare species.