The Pirin Mountains (, Thracian: Oρβηλος, Orbellos, "snow-white mountain") are a mountain range in southwestern Bulgaria, with Vihren (2,914 m high) the highest peak, situated at . The range extends about 40 km northwest-southeast, and about 25 km wide. Most of the range is protected in the Pirin National Park. The mountain is named after Perun (Cyrillic: Перун), the highest god of the Slavic pantheon and the god of thunder and lightning.