 The volcanoes Spitaksar (3560 m) and Geghasar (3446 m), the former erupted 120ka ago and the latter 80-40ka, are sources of obsidian in Armenia.Bird fauna of Gegham Mountain Range includes about 250 species, what makes 70% of all Armenia's avifauna.The South-Eastern slopes of Gegham mountains contain the Khosrov forest, planted in the 4th century by Khosrov I and converted into a state park in 1958.