Bwindi Impenetrable National Park is a protected area in southwestern Uganda. It is part of the Bwindi Impenetrable Forest and is located near the border with the Democratic Republic of the Congo, close to Virunga National Park and on the edge of the Albertine Rift. The park covers 321 square kilometers (124 square miles) of lowland and mountain forests. It can only be reached by walking. It is recognized as a World Heritage Site by the United Nations Educational, Scientific and Cultural Organization.
The park is known for its wide variety of living things. It is home to 120 types of mammals, 350 types of birds, 310 types of butterflies, 27 types of frogs, chameleons, and geckos, as well as many endangered species. In terms of plants, the park has more than 1,000 flowering plant species, including 200 types of trees and 104 types of ferns. The northern part of the park, which is at a lower elevation, has many species of Guineo-Congolian plants, including two endangered species: the brown mahogany and Brazzeia longipedicellata. This area is especially known for having many species that are found only in the Albertine Rift region.
The park protects several animal species, including colobus monkeys, chimpanzees, and birds such as hornbills and turacos. It is most famous for the 400 Bwindi gorillas, which make up half of the world’s population of the endangered mountain gorilla. Fourteen groups of mountain gorillas live in four areas of the park: Buhoma, Ruhijja, Rushaga, and Nkuringo. These areas are located in the districts of Kanungu, Kabale, and Kisoro. The park is managed by the Uganda Wildlife Authority.
History
In 1932, two areas of the Bwindi Impenetrable Forest were named Crown Forest Reserves. The northern area was called the "Kayonza Crown Forest Reserve," and the southern area was called the "Kasatora Crown Forest Reserve." Together, these reserves covered 207 square kilometers (80 square miles). In 1942, the two reserves were joined together and made bigger, then renamed the Impenetrable Central Crown Forest. This new protected area covered 298 square kilometers (115 square miles) and was managed by both the Ugandan government's game and forest departments.
In 1964, the reserve was named an animal sanctuary to give more protection to its mountain gorillas and was renamed the Impenetrable Central Forest Reserve. In 1966, two other forest reserves were added to the main reserve, increasing its size to nearly 321 square kilometers (124 square miles). The park was still managed as both a game sanctuary and a forest reserve.
In 1991, the Impenetrable Central Forest Reserve, along with Mgahinga National Park and Rwenzori Mountains National Park, was named a national park and renamed Bwindi Impenetrable National Park. It covered an area of 330.8 square kilometers (127.7 square miles). The national park was created partly to protect many species, especially mountain gorillas. This change affected the Indigenous Batwa people, who were forced to leave the forest and could no longer enter the park or use its resources. Gorilla tracking became a tourist activity in April 1993, and the park became a popular place for visitors. In 1994, a 10 square kilometer (3.9 square mile) area was added to the park, and it was listed on the World Heritage List. The park's management changed when Uganda National Parks, later renamed the Uganda Wildlife Authority, took charge. In 2003, a 4.2 square kilometer (1.6 square mile) area near the park was bought and added to the park.
In March 1999, a group of 100–150 former Rwandan Interahamwe guerrillas entered the park from the Democratic Republic of the Congo and kidnapped 14 foreign tourists and their Ugandan guide from the park headquarters. They released six people and killed the other eight with machetes and clubs. Some victims were hurt badly, and at least one female victim was attacked. The Ugandan guide was set on fire. The attack was meant to "destabilize Uganda" and scare tourists away, which would reduce income for the Ugandan government. The park closed for several months, and gorilla tours became less popular for years. However, attendance has since recovered because the area has become more stable. Now, armed guards accompany every tour group.
Geography and climate
Kabale town, located to the south-east, is the closest main town to the park, 29 kilometers (18 miles) away by road. The park consists of two separate forest areas connected by a narrow strip of forest. The park's shape is the result of past conservation efforts, as the original two forest areas were protected in 1932. There is farmland outside the park's borders where trees once grew. Farming in this area is very common and intensive.
The park's underlying rock types include 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 formed by the upward movement of the Western Rift Valley. The park's landscape is rough and uneven, with narrow valleys crossed by rivers and steep hills. Elevations in the park range from 1,190 to 2,607 meters (3,904 to 8,553 feet), and 60 percent of the park is above 2,000 meters (6,600 feet). The highest point is Rwamunyonyi Hill at the park's eastern edge. The lowest part of the park is at its northernmost tip.
The forest is an important source of water. Due to the park's geology, which does not allow water to easily soak into the ground, water flows mainly through large cracks in the rock. Most of the park's rainfall becomes streams, and the forest has a dense network of streams. Many rivers begin in the park, including the Ivi, Munyaga, Ihihizo, Ishasha, and Ntengyere rivers, which flow into Lake Edward. Other rivers flow into Lakes Mutanda and Bunyonyi. The forest provides water to nearby agricultural areas.
Bwindi has a tropical climate. Average temperatures range from 7 to 15°C (45 to 59°F) to 20 to 27°C (68 to 81°F). Annual rainfall is between 1,400 and 1,900 millimeters (55 to 75 inches). Rainfall is heaviest from March to April and from September to November. The park's forest helps control the climate and environment in the surrounding area. Water released from the forest's plants increases rainfall in nearby regions. It also reduces soil erosion, a major issue in south-western Uganda. The forest helps prevent flooding and ensures streams continue to flow during dry seasons.
Biodiversity
The Bwindi Impenetrable Forest is very old, complex, and has a wide variety of plant and animal life. The park is known for its many different species and was declared a UNESCO World Heritage Site because of its importance to the environment. Among East African forests, Bwindi has some of the most diverse groups of trees, small mammals, birds, reptiles, butterflies, and moths. The variety of species in the park is partly due to the many different elevations and types of habitats found there. It may also be because the forest provided shelter for animals during cold periods in the Pleistocene epoch. The park's forests are afromontane, a rare type of vegetation in Africa. Located where flat and mountain forests meet, the park has a range of forests from low to high altitudes, a feature found in few places in East Africa. The park is home to more than 220 tree species, over 50% of Uganda's tree species, and more than 100 fern species. The brown mahogany is a plant species that is at risk of disappearing in the park.
Bwindi Impenetrable National Park is important for protecting afromontane wildlife, especially animals that live only in the Western Rift Valley's mountains. It is believed to have one of the most diverse groups of animals in East Africa, including more than 350 bird species and over 200 butterfly species. There are about 120 mammal species in the park, 10 of which are primates and more than 45 are small mammals. Animals found in the park include mountain gorillas, common chimpanzees, L’Hoest’s monkeys, African elephants, African green broadbills, cream-banded swallowtails, black and white colobus monkeys, red-tailed monkeys, vervets, and giant forest hogs. Little is known about the types of fish in the park’s rivers and streams.
The first census of chimpanzees in the park was conducted in 2025 and found 426 chimpanzees living in Bwindi.
Bwindi Impenetrable National Park is home to a group of mountain gorillas (Gorilla beringei beringei), known as the Bwindi population, which makes up nearly half of all mountain gorillas in the world. A census in 2006 showed that the number of mountain gorillas in the park increased slightly from about 300 in 1997 to 320 in 2002 and 340 in 2006. A census in 2018 found 36 social groups of mountain gorillas, totaling 459 individuals, plus 16 solitary gorillas in the park. The greatest threats to the gorillas are poaching, disease, and loss of habitat. Craig Stanford proposed that the Bwindi mountain gorillas may be a separate, unnamed subspecies of Gorilla beringei.
The mountain gorilla is an endangered species, with an estimated total population of about 650 individuals. No mountain gorillas are currently in captivity, though some were captured in the 1960s and 1970s to begin breeding programs in captivity.
Conservation
The park is managed by the Uganda Wildlife Authority, a government organization. The park has strict protection rules, but nearby communities can use some of its resources.
The areas near the park have many people, with more than 300 people living in each square kilometer (780 per square mile). Some of these people are among the poorest in Uganda. The large number of people and poor farming methods put a lot of pressure on the Bwindi forest, which is a major threat to the park. Ninety percent of the people in the area rely on growing crops to feed their families, as farming is one of the few ways they earn money.
Before the park became a national park in 1991, it was a forest reserve with less strict rules about who could enter. People nearby hunted, mined, cut down trees, made wood products, and kept bees in the park. It became a national park in 1991 because of its rich variety of plants and animals and the dangers to the forest. This change gave the park stronger protection. Government agencies increased efforts to protect the park, and nearby communities could no longer access the forest. This change caused anger and conflict between local people and park officials. The Batwa, a group of people who lived in the forest, were greatly affected. The Batwa fished, collected wild yams and honey, and had homes and sacred places in the park. Even though the Batwa had lived in the area for many years and did not harm the forest, they did not receive money or land rights when they were forced to leave. Non-Batwa farmers who had cut down trees to grow crops received compensation and had their land rights recognized. People have lost animals and crops due to wildlife, and some people have died. Training gorillas to be around humans for tourism may have made the gorillas less afraid of people, leading to more damage to homes and farmland.