Papua New Guinea (Wikipedia) Papua New Guinea, officially the Independent State of Papua New Guinea, is a country in Oceania that comprises the eastern half of the island of New Guinea and its offshore islands in Melanesia (a region of the southwestern Pacific Ocean north of Australia). It shares its only land border with Indonesia to the west and its other close neighbours are Australia to the south and the Solomon Islands to the east. Its capital, located on its southern coast, is Port Moresby. The country is the world’s third largest island country, with an area of 462,840 km2 (178,700 sq mi).