Niokolo Koba is not a city, but a national park located in Senegal, West Africa. It is one of the largest and most important wildlife reserves in the country, covering an area of about 9,130 square kilometers (3,521 square miles). The park is known for its rich biodiversity, including various species of mammals, birds, reptiles, and plants. It is home to several endangered species, such as the West African lion, elephant, chimpanzee, and leopard. Niokolo Koba National Park was designated as a UNESCO World Heritage Site in 1981.