Papua New Guinea has one land border—that which divides the island of New Guinea. Across the 820 km (509 mi) border is the Papua province of Indonesia, which contains most of the western half of the island (West Papua was split off in 2003, and forms the remainder). Papua New Guinea's border with Indonesia is not straight; the border loops slightly to the west along the Fly River in the south-central part of New Guinea, on the western edge of Papua New Guinea's Western Province. There are maritime borders with Australia to the south and Solomon Islands to the southeast.