Bayuvi Dupki–Dzhindzhiritsa

Bayuvi Dupki–Dzhindzhiritsa (Bulgarian: Баюви дупки–Джинджирица), also spelled Doupki–Djindjiritza, is a nature reserve in Pirin National Park, located in the homonymous mountain range in south-western Bulgaria. It is situated in Razlog Municipality, Blagoevgrad Province. 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. The reserve encompasses territory between 1200 and 2907 m altitude. Geologically it is dominated by Proterozoic marbles and has extensive karst terrain with numerous caves and karst formations.