Ruaha National Park is the largest national park in Tanzania and East Africa. The name of the park is derived from the Great Ruaha River, which flows along its south eastern margin and is the focus for game-viewing. The park can be reached by car from Iringa and Dar Es Salaam. The park has a very large elephant population. More than 571 species of birds have been identified in the park. Among the resident species are hornbills. Many migratory birds visit the park. Other noted animals found in this park are cheetah, African leopard, lion (Africa's second largest population, representing 10 per cent of the world population), African wild dog (third largest population in the world), spotted hyena, giraffe, hippopotamus, African buffalo, and sable antelope.