Bwindi Impenetrable Forest

Bwindi Impenetrable National Park is located in southwestern Uganda in East Africa. The park is part of the Bwindi Impenetrable Forest, and is situated along the Democratic Republic of Congo border next to the Virunga National Park and on the edge of the Albertine Rift. It comprises 331 square kilometres (128 sq mi) of jungle forests and contains both montane and lowland forest and is accessible only on foot. The Bwindi Impenetrable National Park is a UNESCO-designated World Heritage Site.

The forest is one of the richest ecosystems in Africa, and the diversity of species is a feature of the park. The park provides habitat for some 120 species of mammals, 348 species of birds, 220 species of butterflies, 27 species of frogs, chameleons, geckos and many endangered species. Floristically Bwindi is amongst the most diverse forests in East Africa, with more than 1,000 flowering plant species including 163 species of trees and 104 species of ferns. The northern (low altitude) sector is rich in species of the Guineo-Congolian flora. These include two species internationally recognized as endangered, Brown mahogany (Lovoa swynnertonii) and Brazzeia longipedicellata. In particular the area shares in the high levels of endemism of the Albertine Rift.

The park is a sanctuary for Columbus monkeys, chimpanzees and many birds (such as hornbills and Turaco). It is perhaps most notable for the 400 Bwindi gorillas, half the world’s population of the critically endangered mountain gorillas. There are ten habituated mountain gorilla groups open to tourism: Mubare; Habinyanja; Rushegura near Buhoma side; and the Nkuringo group, Busingye, Kahungye, Nshongi, Mishaya, and Bweza at Nkuringo side, Bitukura, and Oruzogo at Ruhija side and then the Kyaguriro group for research.

In 1932, two blocks of the Bwindi Impenetrable Forest were designated as Crown Forest Reserves. The Northern block was designated as the “Kayonza Crown Forest Reserve,” and the Southern block designated as the “Kasatora Crown Forest Reserve.” These reserves had a combined area of 207 square kilometres (80 sq mi). In 1942, the two Crown Forest Reserves were combined and enlarged, and renamed the Impenetrable Central Crown Forest. This new protected area covered an area of 298 square kilometres (115 sq mi) and was under the joint control of the Ugandan government’s game and forest departments.

In 1964, the reserve was designated as an animal sanctuary in order to provide extra protection to its mountain gorillas and renamed the Impenetrable Central Forest Reserve. In 1966, two other forest reserves became part of the main reserve, increasing its area to almost 321 square kilometers (124 sq mi). The park continued to be managed as both a game sanctuary and forest reserve.

In 1991, Impenetrable Central Forest Reserve—along with Mgahinga Gorilla Reserve and Rwenzori Mountains Reserve—was designated as a national park and renamed Bwindi Impenetrable National Park. It covered an area of 330.8 square kilometres (127.7 sq mi). The national park was declared in part to protect a range of species within it, most notably the mountain gorilla. The reclassification of the park has a large impact on the Batwa pygmy people, who were evicted from the forest and no longer permitted to enter the park or access its resources. Gorilla trekking became a tourist activity in April 1993, and the park became a popular tourist destination. In 1994, a 10-square-kilometre (3.9 sq mi) area was incorporated into the park. In 1994, it was inscribed on the World Heritage List. The park’s management changed: Uganda National Parks, since renamed Uganda Wildlife Authority, became responsible for the park. In 2003 a piece of land next to the park with an area of 4.2 square kilometres (1.6 sq mi) was purchased and incorporated into the park.

In March 1999, a force of 100-150 former Rwandan Interahamwe guerrillas infiltrated across the border from the Democratic Republic of the Congo and kidnapped 14 foreign tourists and their Ugandan guide from the park headquarters, eventually releasing 6 and murdering the remaining 8 with machetes and clubs; several victims were reportedly tortured, at least one of the female victims was raped, and the Ugandan guide was doused with gasoline and lit on fire. The Interahamwe attack was reportedly intended to “destabilize Uganda” and frighten away tourist traffic from the park, depriving the Ugandan government of vital income. The park was forced to close for several months and the popularity of the gorilla tours suffered badly for several years, though attendance has since recovered due to greater stability in the area. An armed guard also now accompanies every tour group.

Geography and climate
Bwindi Impenetrable National Park is located in southwestern Uganda. The Democratic Republic of Congo borders the western side of the park. It covers an area of 331 square kilometres (128 sq mi). Kabale town to the southeast is the nearest main town to the park, 29 kilometres (18 mi) away by road. The park comprises two blocks of forest that are connected by a small corridor of forest. The shape of the park is a legacy of previous conservation management, when the original two forest blocks were protected in 1932. There is agricultural land where there were previously trees directly outside the park’s borders. Cultivation in this area is intense.

The park’s underlying geology consists of Precambrian shale phyllite, quartz, quartzite, schist and granite. The park is located at the edge of the Western Rift Valley in the highest parts of the Kigezi Highlands, which were created by up-warping of the Western Rift Valley. Its topography is very rugged, with narrow valleys intersected by rivers and steep hills. Altitudes in the Park Range from 1,190 to 2,607 metres (3,900 to 8,553 ft) above sea level, and 60% of the park have an elevation of over 2,000 metres (6,600 ft). The highest elevation in the park is Rwamunyonyi hill at the eastern edge of the park. The lowest part of the park is located at its most northern tip.

The forest is an important water catchment area. With a generally impermeable underlying geology where water mostly flows through large fault structures, water infiltration and aquifers are limited. Much of the park’s rainfall forms streams, and the forest has quite a dense network of streams. The forest is the source of many rivers that flow to the north, west, and south. Major rivers that rise in the park include the Ivi, Munyaga, Ihihizo, Ishasha, and Ntengyere rivers, which flow into Lake Edward. Other rivers flow into Lakes Mutanda and Bunyonyi. Bwindi supplies water to local agricultural areas.

Bwindi has a tropical climate. Annual mean temperature ranges from a minimum of 7–15°C to a maximum of 20–27°C. Its annual rainfall ranges from 1,400 to 1,900 millimeters (55 to 75 in). Peak rainfall occurs from March to April and from September to November. The park’s forest plays an important role in regulating the outside area’s environment and climate. High amounts of evapotranspiration from the forest’s vegetation increases the amount of precipitation that the region outside the park receives. They also lessen soil erosion, which is a serious problem in southwestern Uganda. They lessen flooding and ensure that streams continue to flow in the dry season.

Biodiversity
Bwindi Impenetrable Forest is old, complex, and very biologically rich. Diverse species are a feature of the park, and it became an UNESCO World Heritage Site because of its ecological importance. Among East African forests, Bwindi has some of the richest populations of trees, small mammals, birds, butterflies, reptiles, and moths. The park’s diverse species are partly a result of the large variations of altitude and habitat types in the park, and may also be because the forest was a refuge for species during glaciations in the Pleistocene epoch.

The park’s forests are afro-montane, which is a rare vegetation type on the African continent. Located where plain and mountain forests meet, there is a continuum of low-altitude to high altitude primary forests in the park, one of the few large tracts of East African forest where this occurs. The park has more than 220 tree species, (more than 50% of Uganda’s tree species) and more than 100 fern species. The Brown Mahogany is a threatened plant species found within the park.

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