 Bayuvi Dupki–Dzhindzhiritsa is among the nation's oldest reserves, declared in 1934 to protect the forests of Macedonian pine ("Pinus peuce") and Bosnian pine ("Pinus heldreichii"), both Balkan endemic species.Its territory was further expanded in 1976 and 1980 and spans an area of 2873 ha or 28,73 km2.It was declared a UNESCO Biosphere Reserve in 1977.