Papua New Guinea, officially the Independent State of Papua New Guinea, is a sovereign state in Oceania that occupies 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. Its capital, located along its southeastern coast, is Port Moresby. The western half of New Guinea forms the Indonesian provinces of Papua and West Papua. It is the world's third largest island country with 462,840 km² (178,700 sq mi).