ivory on a site within the park. This event improved Kenya's conservation and wildlife protection image. Geography The park covers an area of and is small in comparison to most of Africa's national parks. The park's altitude ranges between . It has a dry climate. The park is the only protected part of the Athi-Kapiti ecosystem, making up less than 10% of this ecosystem. The park has a diverse range of habitats and species. The park is located about from the Nairobi's centre. There is electric fencing around the park's northern, eastern, and western boundaries. Its southern boundary is formed by the Mbagathi River. This boundary is not fenced and is open to the Kitengela Conservation Area (located immediately south of the park) and the Athi-Kapiti plains. There is considerable movement of large ungulate species across this boundary. Flora The park's predominant environment is open grass plain with scattered Acacia bushes. The western uplands of the park have highland dry forest with stands of Olea africana, Croton dichogamus, Brachylaena hutchinsii, and Calodendrum. The lower slopes of these areas are grassland. Themeda, cypress, Digitaria, and Cynodon species are found in these grassland areas. There are also scattered yellow-barked Acacia xanthophloea. There is a riverine forest along the permanent river in the south of the park. There are areas of broken bush and deep rocky valleys and gorges within the park. The species in the valleys are predominantly Acacia and Euphorbia candelabrum. Other tree species include Apodytes dimidiata, Canthium schimperiana, Elaeodendron buchananii, Ficus eriocarpa, Aspilia mossambicensis, Rhus natalensis, and Newtonia species. Several plants that grow on the rocky hillsides are unique to the Nairobi area. These species include Euphorbia brevitorta, Drimia calcarata, and Murdannia clarkeana. Fauna The park has a large and diverse wildlife population. Species found in the park include lion, leopard, African buffalo, black rhinoceros, giraffe, hippopotamus, spotted hyena, blue wildebeest, plains zebra, cheetah, Thomson's gazelle, Grant's gazelle, common eland, impala, hartebeest, waterbuck, common warthog, olive baboon, black-backed jackal, common ostrich, and Nile crocodile. Herbivores, including wildebeest and zebra, use the Kitengela conservation area and migration corridor to the south of the park to reach the Athi-Kapiti plains. They disperse over the plains in the wet season and return to the park in the dry season. The concentration of wildlife in the park is greatest in the dry season, when areas outside the park have dried up. Small dams built