Nukumanu, formerly Tasman Islands, is an atoll of Papua New Guinea, located in the Southwestern Pacific Ocean, 4 degrees south of the equator. Administratively Nukumanu is part of Papua New Guinea, but it lies quite far away from the closest territory of Papua New Guinea proper, which is the coast of New Ireland island at 682 km to the west. The nearest land is Ontong Java Atoll, located only 38 km to the south of Nukumanu. The border between Papua New Guinea and the Solomon Islands runs between these neighboring atolls, which form a small geographic group together with the wholly submerged Roncador Reef at the southern end.
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