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In page Geography of Papua New Guinea:

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Papua New Guinea has a total area of 462,840 km2 (178,700 sq mi), of which 452,860 km2 (174,850 sq mi) is land and 9,980 km2 (3,850 sq mi) is water. This makes it the 3rd largest island country in the world.[1] Its coastline is 5,152 km (3,201 mi) long.[citation needed]