Roper River

River in Northern Territory, Australia, formed by the confluence of Waterhouse River and Beswick Creek east of Mataranka and flowing east for 250 miles (400 km) to Limmen Bight on the Gulf of Carpentaria. It marks the southern limit of the rugged region known as Arnhem Land. The flow of the river system, which drains an area of 23,500 square miles (60,860 square km), increases greatly during