Nyerere National Park (formerly Selous Game Reserve) is the largest National Park in Africa and is about twice the size of Denmark. Visitors are restricted to the area north of the Rufiji River – the landscape here is largely open grassland and acacia woodland. The density of animals in the park is lower than other parks (poaching has been a big problem in the past) but being here gives you the feeling of being somewhere where little has changed for hundreds of years. During a game drive you are unlikely to see any other vehicles. The Rufiji River forms a wide delta where it flows through Nyerere National Park, which provides a unique ecosystem for aquatic animals. Hippo and crocodile sightings are especially notable and elephant, lion, buffalo, wild dog and over 400 species of bird can also be seen.