Bougainville, officially the Autonomous Region of Bougainville and previously known as North Solomons, is an autonomous region in Papua New Guinea. The largest island is Bougainville Island (also the largest of the Solomon Islands archipelago). The region also includes Buka Island and assorted outlying nearby islands including the Carterets. The interim capital is Buka, though it is expected that Arawa will become the permanent capital in the future.