| a group of islands in Papua New Guinea, in the W central Pacific Ocean, including the Admiralty Islands, New Britain, New Ireland, and adjacent islands. ab. 23,000 sq. mi. (59,570 sq. km). |
| Bismarck Archipelago A group of volcanic islands and islets of Papua New Guinea in the southwest Pacific Ocean. The islands were discovered by Dutch explorers in the early 1700s. |