Which islands are part of Papua New Guinea besides the eastern half of New Guinea?

In addition to the eastern half of the island of New Guinea, Papua New Guinea includes numerous other islands and archipelagos. These include:

• Bismarck Archipelago: A major group northeast of New Guinea that includes New Britain, New Ireland, the Admiralty Islands, New Hanover (Lavongai), the Duke of York Group, and the Witu Islands.21
• Solomon Islands chain: This includes Bougainville Island and Buka Island, which form an autonomous region of Papua New Guinea.234
• Other island groups: These include the D’Entrecasteaux Islands (such as Fergusson, Goodenough, and Normanby islands), the Louisiade Archipelago, the Trobriand Islands, and Muyua Island.2

The country also encompasses various small offshore islands and atolls.3