Ruaha National Park takes its name from the Ruaha River, which flows along its southeastern border. The river provides permanent water in the park, and during the dry season there is a large concentration of wildlife along its banks. Covering an area of 20,226 square kilometres, Ruaha is the largest National Park in Tanzania. The park is rich in flora and fauna with a great variety of wildlife including the rare the Kudu (both Greater and Lesser Kudu), Roan & Sable Antelopes and some endangered species like wild dogs. Ruaha is famous for its large herds of elephants said to have the highest concentration in East Africa. Other animals in the park include buffaloes, lions, leopards, cheetah, giraffes, zebras, elands, impala, bat eared foxes, Jackals, and the hippos and crocodiles which inhabit the river. The park is rich in bird life with more than 571species including migrants from within Africa, Europe, Asia, Australian rim and Madagascar.