The Bwindi Impenetrable National Park (BINP) is in southwestern Uganda. The park is part of the Bwindi Impenetrable Forest and is situated along the Democratic Republic of the Congo (DRC) border next to the Virunga National Park and on the edge of the Albertine Rift. Composed of of both montane and lowland forest, it is accessible only on foot. BINP is a United Nations Educational, Scientific and Cultural Organization-designated World Heritage Site. Species diversity is a feature of the park. It provides habitat for 120 species of mammals, 350 species of birds, 310 species of butterflies, 27 species of frogs, chameleons, geckos, and many endangered species. Floristically, the park is among the most diverse forests in East Africa, with more than 1,000 flowering plant species, including 200 species of trees and 104 species of ferns. The northern (low elevation) sector has many species of Guineo-Congolian flora, including two endangered species, the brown mahogany and Brazzeia longipedicellata. In particular, the area shares in the high levels of endemisms of the Albertine Rift. The park is a sanctuary for colobus monkeys, chimpanzees, and many birds such as hornbills and turacos. It is most notable for the 400 Bwindi gorillas, half of the world's population of the endangered mountain gorillas. 14 habituated mountain gorilla groups are open to tourism in four different sectors of Buhoma, Ruhijja, Rushaga and the Nkuringo in the Districts of Kanungu, Kabale and Kisoro respectively all under the management of Uganda Wildlife Authority. History 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 . In 1942, the two reserves were combined and enlarged, then renamed the Impenetrable Central Crown Forest. This new protected area covered 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 to provide extra protection for 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 . The park continued to be managed as both a game sanctuary and forest reserve. In 1991, the Impenetrable Central Forest Reserve, along with the Mgahinga Gorilla Reserve and the Rwenzori Mountains Reserve,