Tanzania contains some 20 percent of the species of Africa’s large mammal population, found across its reserves, conservation areas, marine parks, and 17 national parks, spread over an area of more than 42,000 square kilometres (16,000 sq mi) and forming approximately 38 percent of the country's territory. Wildlife resources of Tanzania are described as "without parallel in Africa" and "the prime game viewing country". Serengeti National Park, the country's second largest national park area at 14,763 square kilometres (5,700 sq mi), is located in northern Tanzania and is famous for its extensive migratory herds of wildebeests and zebra while also having the reputation as one of the great natural wonders of the world. The Ngorongoro Conservation Area, established in 1959, is a UNESCO World