Pirin mountain is situated in South-West Bulgaria and is part of the Rila-Rhodope mountain massif.
It has an area of 2585 km2 and its highest peak is Vihren (2914 m). Due to its extremely rich biodiversity and spectacular nature formations, 40 356 ha from the territory of the mountain has been proclaimed by the Bulgarian government for a protected area – National Park Pirin.
Since 1983 National Park Pirin has been included in the Convention on Protection of the World Cultural and Natural Heritage of UNESCO.
More than 2000 years ago the Thracians used to call the mountain Orbelus (the snowy mountain). Later the Slavs called it Pirin, after the God Perun- the highest God in Slavic mythology, who they believed, lived on the top of the mountain.