Situated to the north of Australia, Papua New Guinea has a total land area of 462,840 sq km (178,704 sq mi), including the large islands of New Britain, New Ireland, and Bougainville and hundreds of smaller islands. Comparatively, the area occupied by PNG is slightly larger than the state of California. The country extends 2,082 km (1,294 mi) NNE – SSW and 1,156 km (718 mi) ESE – WNW . Mainland Papua New Guinea shares the island of New Guinea, the second-largest island in the world, with Irian Jaya, a province of Indonesia. To the N is the US Trust Territory of the Pacific Islands; to the E , the Solomon Islands; to the W , Irian Jaya; and about 160 km (100 mi) to the S , the nearest neighbor, Australia. Papua New Guinea has a total boundary length of 5,972 km (3,711 mi), of which 5,152 km (3,201 mi) is coastline.
PNG's capital city, Port Moresby, is located on the country's southern coast.