Pirin National Park (Bulgarian: Национален парк "Пирин"), originally named Vihren National Park, covers most of the Pirin Mountains in southwestern Bulgaria. It spans an area of 403.56 square kilometers (155.82 square miles).
It is one of three national parks in Bulgaria, along with Rila National Park and Central Balkan National Park. The park was created in 1962, and its boundaries have been expanded multiple times since then. Pirin National Park was declared a UNESCO World Heritage Site in 1983. The elevation within the park ranges from 950 meters (3,120 feet) to 2,914 meters (9,560 feet) at Vihren, which is Bulgaria’s second-highest mountain peak and the third-highest in the Balkans.
The park is located in Blagoevgrad Province, the southernmost region of Bulgaria. It includes land from seven municipalities: Bansko, Gotse Delchev, Kresna, Razlog, Sandanski, Simitli, and Strumyani. No towns or villages are located inside the park. Two nature reserves are within Pirin National Park: Bayuvi Dupki–Dzhindzhiritsa and Yulen. Bayuvi Dupki–Dzhindzhiritsa is one of Bulgaria’s oldest nature reserves, established in 1934. It is part of the UNESCO Man and Biosphere Programme’s World Network of Biosphere Reserves. The entire park is included in the European Union’s Natura 2000 network of protected areas.
Pirin National Park is known for its 118 glacial lakes, with Popovo Lake being the largest and deepest. Many of these lakes are found in cirques, which are bowl-shaped valleys formed by glaciers. A few small glaciers, such as Snezhnika and Banski Suhodol, are also present. These glaciers are the southernmost in Europe.
The park lies within the Rodope montane mixed forests ecoregion of the Palearctic temperate broadleaf and mixed forest. Forests cover 57.3% of the park’s area, and nearly 95% of these are coniferous forests. The average age of the forests is 85 years. Bulgaria’s oldest tree, Baikushev’s pine, is located in the park. This tree is about 1,300 years old and lived during the time when the Bulgarian state was founded in 681 CE. The park is home to a wide variety of wildlife, including 45 species of mammals, 159 species of birds, 11 species of reptiles, 8 species of amphibians, and 6 species of fish.
History and park administration
Pirin National Park was created on November 18, 1962, to protect natural ecosystems, landscapes, and the plant and animal life that live there. It was first called Vihren National Park and covered an area of 67.36 square kilometers. Over time, the protected area grew larger and reached its current size of 403.56 square kilometers in 1999. In 1983, Pirin National Park was added to the UNESCO World Heritage Sites list because it is a place of great natural importance. According to Bulgaria’s Constitution, the park belongs to the government and is not owned by private individuals.
The park is classified by the International Union for Conservation of Nature as a national park (management category II). Its main goal is to protect ecosystems while allowing people to visit and enjoy the area. The entire park is part of the European Union’s Natura 2000 network, which helps protect natural habitats. Pirin National Park is also recognized as an important bird and biodiversity area by BirdLife International.
The park is managed by a group under Bulgaria’s Ministry of Environment and Water. This group is based in the town of Bansko, near the northern base of the mountain. In 2004, the park had 92 employees. There are two visitor and information centers located in Bansko and Sandanski. The park is divided into six areas: Bayuvi Dupki, which has an office in Razlog; Vihren, which has an office in Bansko; Bezbog, which has an office in Dobrinishte; Trite Reki and Kamenitsa, both of which have offices in Sandanski; and Sinanitsa, which has an office in Kresna.
Geography
Pirin National Park covers much of the Pirin mountain range in southwestern Bulgaria, which is part of the Rila–Rhodope Massif. To the north, the park is separated from the Rila mountain range by the Predel Saddle and mountain pass at 1,140 meters elevation. To the east, the park reaches the valley of the Mesta River, including the Razlog Valley. To the south, the Paril Saddle (1,170 meters) marks the border with the Slavyanka mountain range. To the west, the park extends into the Struma River valley. The entire park is located within Blagoevgrad Province, covering parts of several municipalities: Bansko (36.6%), Gotse Delchev (4.9%), Kresna (14.9%), Razlog (10.2%), Sandanski (30.7%), Simitli (2.3%), and Strumyani (0.4%).
The formation of Pirin’s landscape is due to ancient geological events, including those from the Precambrian and Hercynian periods, as well as Alpine and other tectonic activities. The modern shape of the mountain was shaped during the Pleistocene era (2,588,000 to 11,700 years ago), when glaciers covered the area due to global cooling. These glaciers formed at the same time as those in the Alps. The glaciers reached elevations of 2,200–2,300 meters, and all glacial features in the mountain range are within Pirin National Park.
The Pirin mountain range is divided into three sections: northern, middle, and southern. The northern section is the highest and includes all glacial formations and lakes. The park covers the northern section, which is split into two zones. The northern zone includes the steep marble Vihren ridge, which has the three highest peaks in the mountain: Vihren (2,914 meters), Kutelo (2,908 meters), and Banski Suhodol (2,884 meters), as well as the Koncheto ridge (2,810 meters). The southern zone includes granite ridges and features Pirin’s fourth-highest peak, Polezhan (2,851 meters). There are more than 60 peaks above 2,600 meters.
The landscape of Pirin National Park is alpine and highly broken, with steep slopes, high ridges, and deep river valleys. The highest point is Vihren at 2,914 meters, the second-highest peak in Bulgaria and the third-highest in the Balkan Peninsula. The lowest elevation in the park is 950 meters near Bansko. Nearly 60% of the park’s area is above 2,000 meters. The distribution of elevations in the park is as follows: up to 1,000 meters – 1.64 km (0.4%); 1,000–1,600 meters – 51.09 km (12.7%); 1,600–2,000 meters – 121.08 km (30.0%); 2,000–2,500 meters – 198.31 km (49.1%); and above 2,500 meters – 31.45 km (7.8%). Over 90% of the park’s area is classified as steep (21–30°) or very steep (above 31°).
Geologically, Pirin is a large folded rock structure made of metamorphic rocks, such as gneiss, biotite schist, crystalline schist, amphibolite, quartzite, and marble. Paleozoic granitoid rocks are found in limited areas near the edges of the park. Granitoid rocks from the Upper Cretaceous form two distinct areas: Northern Pirin and Bezbog. The Central Pirin area covers the southern part of the park and dates to the Upper Oligocene. Granitoid rocks cover 55% of the park’s territory.
Pirin lies in the continental Mediterranean climate zone, but its high elevation creates an Alpine climate in the upper areas. The climate is influenced by Mediterranean storms in late autumn and winter, which bring frequent and heavy rainfall, and by the Azores high-pressure system in summer, which makes the weather hot and dry. The mountain’s shape strongly affects the climate. Pirin has three elevation-based climate zones: low (600–1,000 meters, 16% of the area), middle (1,000–1,800 meters, 40%), and high (above 1,800 meters, 44%). Temperatures decrease with elevation, especially in summer. Average annual temperatures are 9–10°C in the lower zones, 5–7°C in the middle zones, and 2–3°C in the higher zones. The coldest month is January, with average temperatures between −5°C and −2°C. The hottest month is July, with average temperatures of 20°C at 1,600 meters and 15°C at 2,000 meters. Temperature inversions, where temperatures increase with height, occur on 75% of winter days.
Annual rainfall ranges from 600–700 mm in lower areas to 1,000–1,200 mm in higher areas. Most rainfall occurs in winter and spring, with summer being the driest season. Air humidity is 60–75% in August and 80–85% in December. Winter precipitation is mostly snow, with 70–90% at lower elevations and 100% at higher elevations. The number of days with snow cover ranges from 20–30 at lower elevations to 120–160 at higher elevations. The thickest snow cover reaches 40–60 cm at 1,000–1,800 meters in February and 160–180 cm above 1,800 meters in March (190 cm on Vihren). In some winters, snow thickness can reach 250–350 cm. Avalanches are common in winter.
The park’s area is nearly equally divided between the Struma River basin (51.1%) and the Mesta River basin (48.9%). The boundary between these basins follows the main mountain ridge
Biology
Pirin National Park is part of the Rodope montane mixed forests ecoregion in the Palearctic temperate broadleaf and mixed forest. The plant communities in the park can be grouped into several categories: those near water; subalpine shrub communities; grasslands, including meadows, subalpine, and alpine pastures; forest communities; rock communities; and communities affected by human activity.
Forests cover 231.10 square kilometers, or 57.3% of the park’s total area. Of these, 95% are coniferous forests and 5% are deciduous forests. The average age of the forest is 85 years. About 34.3% of the forested area has trees older than 140 years. The oldest tree in Bulgaria, a 1,300-year-old Baikushev’s pine (Pinus heldreichii), is located in the park and is the same age as the founding of the Bulgarian state in 681 AD.
There are 16 tree species in the park. Three of these are found only in the Balkans and have limited ranges: the Bulgarian fir (Abies borisii-regis), Macedonian pine (Pinus peuce), and Bosnian pine (Pinus heldreichii). The largest areas are covered by dwarf mountain pine (Pinus mugo) – 59.62 square kilometers; Macedonian pine – 54.15 square kilometers; Norway spruce (Picea abies) – 23.79 square kilometers; European beech (Fagus sylvatica) – 10.98 square kilometers; and Bosnian pine – 8.93 square kilometers. The Macedonian and Bosnian pines in Pirin National Park make up 42% and 52% of their total areas in Bulgaria, respectively.
The park’s plant life is diverse and has many species found nowhere else because of its southern location and varied elevations. The different landforms create many types of habitats for plants, which are further influenced by the types of rock, such as siliceous and calcareous terrain. Lakes and streams add wetland areas that support plants needing moist conditions.
Non-vascular plants, such as algae, mosses, and lichens, are the least studied part of the park’s plant life. Algae include 165 species, two of which are found only in the park. The highest number of algae species is found in the Popovo and Kremenski lake groups. Mosses are represented by 329 known species. Lichens include 367 species, or 52% of Bulgaria’s total lichen diversity. Of these, 209 are found in coniferous forests and 156 are on calcareous terrain.
Vascular plants in Pirin National Park include 1,315 species from 94 families and 484 genera, or about one-third of Bulgaria’s total vascular plant diversity. The park’s plant life has largely remained native. More species may be discovered with further research, especially at lower elevations. The species are almost equally divided between those from the sub-Mediterranean and Circumboreal regions. The Red Book of Bulgaria lists 114 species. Eighteen species are found only in the park, and 17 are found only in Bulgaria, totaling 35 Bulgarian endemic species. The park is also home to 86 species found only in the Balkans.
The park’s endemic species include: Pirin poppy (Papaver degenii), Pirin meadow-grass (Poa pirinica), Urumov oksitropis (Oxytropis urumovii), Kozhuharov oksitropis (Oxytropis kozhuharovii), Banderishka lady’s mantle (Alchemilla bandericensis), Pirin lady’s mantle (Alchemilla pirinica), Kelererova asineuma (Asyneuma kellerianum), Pirin sandwort (Arenaria pirinica), Pirin sedge (Carex pirinensis), Pirin fleabane (Erigeron vichrensis), David mullein (Verbascum davidoffii), lesser Pirin fescue (Festuca pirinica), Pirin hogweed (Heracleum angustisectum), Yavorkova rattle (Rhinanthus javorkae), Pirin thyme (Thymus perinicus), Daphne domini, and Daphne velenovskyi.
The vertebrate animals in Pirin National Park include 229 species. There are 45 mammal species, divided as follows: Insectivora – 5, Chiroptera – 16, Lagomorpha – 3, Rodentia – 7, Carnivora – 9, and Artiodactyla – 4. The European snow vole is a relict species. Among the most important species for conservation are the brown bear, lynx, and wolf.
The park’s bird life includes 250 species. The European eagle owl, black stork, and golden eagle are among the most notable.
The park’s amphibians and reptiles include 35 species. The European fire-b
Recreation
Pirin National Park is a well-known place for tourists. The park's main visitor center is located in Bansko and includes an interactive display about the park's forests. This display helps visitors learn about the types of plants and animals found in the area. The center also has a 30-seat projection room equipped with tools for showing videos and images. As of 2002, there were 1,837 beds available within the park, including 885 in mountain refuges, 214 in hotels, 124 in bungalows, and 615 in buildings used by government agencies. Some of the refuges are Bezbog, the largest and most modern one; Banderitsa, built in 1915 by order of Tsar Ferdinand I of Bulgaria; and Vihren.
There are 20 marked hiking trails in the park. Trail No. 1 is part of the E4 European long-distance path and passes through the park along a route from Predel Refuge to Yavorov Refuge, then to Vihren Refuge, Tevno Lake, Pirin Refuge, and Popov Grasslands. The most difficult hiking trail runs along the top of the Koncheto ridge at an elevation of about 2,810 meters, between the peaks Banski Suhodol (2,884 meters) and Kutelo (2,908 meters). The north-western side of Koncheto is nearly vertical and drops 300–400 meters, while the south-western side is less steep (about 30 degrees) but drops 800 meters.
Development and Environmental Risks
There are many things that harm the ecosystems in the park. Rock quarries, wildland fires, industrial and illegal logging, poaching, too much use of trails, vehicle access, and especially ski resorts have caused serious danger to the park.
Since the early 1990s, skiing areas have grown in the northeast part of the range, especially in the town of Bansko, which is now an international winter resort. In 2003, a large forest area near Todorka Peak and nearby ridges was cleared to build the resort. The resort now has 13 ski lifts and 75 km of slopes. The expansion happened even though the park's rules clearly say such activities are not allowed. Since the building started, the Glazne River has experienced severe flooding because of the changes to the land.
In December 2017, the Bulgarian government changed the park's rules without warning, allowing commercial logging and building roads and structures in half of the park. This led to protests against the ongoing changes to the world heritage site, which continued through February and March 2018. These protests were supported by Ska Keller, a vice-president of the Greens/EFA group in the European Parliament. In November 2017, the World Wide Fund for Nature and other local groups sued the Bulgarian Ministry of the Environment and Water, saying the development plans broke environmental rules.