Arnhem Land, 37,100 sq mi (96,089 sq km), N Northern Territory, Australia, on a wide peninsula W of the Gulf of Carpentaria. The great majority of the region belongs to the Arnhem Land Aboriginal Reserve, the largest aboriginal reservation in Australia. Kakadu National Park adjoins the reservation and draws a large number of tourists to its natural beauty and remarkable collection of aboriginal rock art. To the S lies the Beswick Aboriginal Reserve. Bauxite is mined in the area.