The Admiralty Islands are an archipelago group of 18 islands in the Bismarck Archipelago, to the north of New Guinea in the South Pacific Ocean. These are also sometimes called the Manus Islands, after the largest island.

Bougainville, officially the Autonomous Region of Bougainville, is an autonomous region in Papua New Guinea. The largest island is Bougainville Island, while the region also includes Buka Island and a number of outlying islands and atolls. The interim capital is Buka, though it is expected that major government services and buildings will be moved to Arawa, following reconstruction.

German New Guinea consisted of the northeastern part of the island of New Guinea and several nearby island groups and was the first part of the German colonial empire. The mainland part of the territory, called Kaiser-Wilhelmsland, became a German protectorate in 1884. Other island groups were added subsequently. New Pomerania, the Bismarck Archipelago, and the northern Solomon Islands were declared a German protectorate in 1885; the Caroline Islands, Palau, and the Mariana Islands were bought from Spain in 1899; the protectorate of the Marshall Islands was bought from Spain in 1885 for $4.5 million by the 1885 Hispano-German Protocol of Rome; and Nauru was annexed to the Marshall Islands protectorate in 1888.

New Caledonia is a special collectivity of France in the southwest Pacific Ocean, south of Vanuatu, about 1,210 km (750 mi) east of Australia and 17,000 km (11,000 mi) from Metropolitan France. The archipelago, part of the Melanesia subregion, includes the main island of Grande Terre, the Loyalty Islands, the Chesterfield Islands, the Belep archipelago, the Isle of Pines, and a few remote islets. The Chesterfield Islands are in the Coral Sea. French people, especially locals, call Grande Terre Le Caillou.

The Northern Solomons were the more northerly group of islands in the Solomon Islands archipelago over which Germany declared a protectorate in 1885. Initially the German Solomon Islands Protectorate included in the south-east Choiseul, Santa Isabel and the Shortlands with highly northern, vast, mainly water Ontong Java Atoll that in 1900 were conferred to the British Solomon Islands Protectorate. Greatest of the region, Bougainville, continued under German administration until World War I when it fell to Australia, and after the war, it formally passed to Australian jurisdiction under a League of Nations mandate.

Papuasia is a Level 2 botanical region defined in the World Geographical Scheme for Recording Plant Distributions (WGSRPD). It lies in the southwestern Pacific Ocean, in the Melanesia ecoregion of Oceania and Tropical Asia.

The Solomon Islands are an archipelago in the western South Pacific Ocean, located northeast of Australia. They are in the Melanesia subregion and bioregion of Oceania. The archipelago forms much of the territory of Solomon Islands, while the northwestern islands are within the Autonomous Region of Bougainville, in eastern Papua New Guinea. It forms the eastern boundary of the Solomon Sea.

The Torres Strait Islands are a group of at least 274 small islands in Torres Strait, the waterway separating far northern continental Australia's Cape York Peninsula and the island of New Guinea. They span an area of 48,000 km2 (19,000 sq mi), but their total land area is 566 km2 (219 sq mi).
The Western Islands are a group of islands in the Bismarck Archipelago, and within Manus Province of the Islands Region, in northern Papua New Guinea.