The Bismarck Archipelago is in which country?

The Bismarck Archipelago is a group of islands off the northeastern coast of New Guinea in the western Pacific Ocean and is part of the Islands Region of Papua New Guinea.

The Bismarck Archipelago includes mostly volcanic islands with a total land area of 49,700 km2 (19,189 sq mi). The archipelago encompasses the Bismarck Sea and sits upon the North Bismarck Plate, the Manus Plate and the South Bismarck Plate.

New Guinea is a large island separated by the shallow Torres Strait from the rest of the Australian continent. It is the world's second-largest island, after Greenland, covering a land area of 785,753 km2 (303,381 sq mi), and the largest island wholly or partly within the Southern Hemisphere and Oceania.