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 has 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 millimetres (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.
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