WAli Botush, also spelled Alibotoush, is a nature reserve in the small mountain range of Slavyanka, located on the border between Bulgaria and Greece. The reserve occupies the northern section of the mountain which lies within the territory of Bulgaria and takes its name from the old name of Slavyanka. It is situated in the municipalities of Sandanski and Hadzhidimovo, Blagoevgrad Province. It was declared in 1951 to protect the largest forests of the endemic Bosnian pine in the Balkan Peninsula. Its territory was further expanded several times and spans an area of 1638 ha or 16,38 km2. It was declared a UNESCO Biosphere Reserve in 1977.
WBayuvi Dupki–Dzhindzhiritsa, 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 and Bosnian pine, 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.
WBistrishko Branishte is a nature reserve in the Vitosha Nature Park on Vitosha Mountain in Bulgaria.
WThe Central Balkan National Park lies in the heart of Bulgaria, nestled in the central and higher portions of the Balkan Mountains. Its altitude varies from 550 m. near the town of Karlovo to 2376 m. at Botev Peak, the highest summit in the mountain range. It was established on 31 October 1991. The Central Balkan National Park is the third largest protected territory in Bulgaria, spanning an area of 716.69 km² with total length of 85 km from the west to the east and an average width of 10 km. It occupies territory from 5 of the 28 provinces of the country: Lovech, Gabrovo, Sofia, Plovdiv and Stara Zagora. The national park includes nine nature reserves covering 28% of its territory: Boatin, Tsarichina, Kozya Stena, Steneto, Severen Dzhendem, Peeshti Skali, Sokolna, Dzhendema and Stara Reka.
WDzhendema or Djendema is an area in the Balkan mountain range in Bulgaria. The Southern Dzhendem, or just Dzhendema, occupies the southern slopes of Mount Botev 42°41′41″N 24°54′41″E. It was established as reserve on March 28, 1953. Djendema encompasses 42.2 km2, and is the largest reserve in the mountain and the second largest reserve in Bulgaria. It is centred on a granite extrusion combined with limestone outcroppings to form a labyrinth of steep slopes; deep, narrow gorges, massive rock cliffs, and huge waterfalls. Djendema Reserve shelters beech and fir forests and large meadows with unique sub-alpine grassy species and communities. Because of its specific geological and climatic conditions, the area is rich in endemic species and rare plants. One could take several days to cross Djendema. The name is derived from Ottoman Turkish cehennem 'hell'.
WMantaritza Biosphere Reserve is situated to the north of Golyama Syutka Peak in the Rhodope Mountains in Bulgaria, and covers an area of 1319,9 hectares. The reserve was established in 1968 to protect the old coniferous forests and the biotopes of the Western capercaillie. The area was declared as biosphere reserve in 1977. It represents century-old forests of pure and mixed stands of Norway spruce (Picea abies), European birch (Fagus sylvatica) and European silver fir (Abies alba). The reserve is situated in the Bulgarian Floristic sub-region of West Rhodope within the Central European mountain biotic province. The varied fauna includes brown bear (Ursus arctos), red deer (Cervus elaphus), roe deer (Capreolus capreolus), wild boar, pine marten (Martes martes), European badger (Meles meles), hazel grouse (Bonasa bonasia), black woodpecker (Dryocopus martius) and European crested tit (Parus cristatus).
WRila National Park is the largest national park in Bulgaria spanning an area of 810.46 km2 in the Rila mountain range in the south-west of the country. It was established on 24 February 1992 to protect several ecosystems of national importance. Its altitude varies from 800 m (2,600 ft) near Blagoevgrad to 2,925 m (9,596 ft) at Musala Peak, the highest summit in the Balkan Peninsula. There are 120 glacial lakes, including the prominent Seven Rila Lakes. Many rivers have their source in the national park, including the river that have most water entirely in the Balkans, the Maritsa, and the longest river entirely in Bulgaria, the Iskar.
WSlavyanka or Orvilos, formerly known as Alibotush and Kitka Planina, is a mountain located on the border of southwestern Bulgaria and northernmost Greece, located south of the Pirin Mountains and connected with it by the Paril Saddle. The highest peak of Slavyanka is Gotsev Vrah at 2,212 m, while other notable peaks include Golyam Tsarev Vrah, Malak Tsarev Vrah, Shabran and Salyuva Dzhamiya. The Bulgarian section of the mountain is part of the Ali Botush Reserve.
WThe Srebarna Nature Reserve is a nature reserve in northeastern Bulgaria, near the village of the same name, 18 km west of Silistra and 2 km south of the Danube. It comprises Lake Srebarna and its surroundings and is located on the Via Pontica, a bird migration route between Europe and Africa.
WStara Reka is one of the nine nature reserves in the Central Balkan National Park in central Bulgaria. Stara Reka was established on 19 March 1981 to protect the unique ecosystems of the Balkan Mountains. It spans an area of 1974.7 hectares, or 19.747km2.
WUzunbodzhak, also transliterated as Ouzounboudjak is an UNESCO Biosphere Reserve, one of the five nature reserves in Strandzha Nature Park in south-eastern Bulgaria. The reserve is sometimes called Lopushna. Uzunbodzhak was established on 13 December 1956 and was included in the UNESCO network of biosphere reserves in March 1977. It covers an area of 2529.6 hectares, or 25.296 km2. All economic activities are prohibited on the territory of the reserve.