Tanzania is home to some of Africa’s most famous national parks and natural attractions, including majestic Mount Kilimanjaro. Vast stretches of plains and plateaus contrast with spectacular relief features, notably Africa’s highest mountain, Kilimanjaro (19,340 feet [5,895 metres]), and the world’s second deepest lake, Lake Tanganyika (4,710 feet [1,436 metres] deep). Because of the historically low density of human settlement, mainland Tanzania is home to an exceptionally rich array of wildlife. Large herds of hoofed animals—wildebeests, zebras, giraffes, buffalo, gazelles, elands, dik-diks, and kudu—are found in most of the country’s numerous game parks. Predators include hyenas, wild dogs, and the big cats—lions, leopards, and cheetahs. Crocodiles and hippopotamuses are common on riverbanks and lakeshores. Small bands of chimpanzees inhabit Gombe National Park along Lake Tanganyika. Nearly 1,500 varieties of birds have been reported, and there are numerous species of snakes and lizards. In all, about one-fourth of Tanzania’s land has been set aside to form an extensive network of reserves, conservation areas, and national parks, a number of which—including Serengeti National Park, the Selous Game Reserve, the Ngorongoro Conservation Area, and Kilimanjaro National Park—have been designated UNESCO World Heritage sites.