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The Great Barrier Reef is the world's largest coral reef.
Rangitoto, Motutapu, Aotea (Great Barrier Island), Hauturu (Little Barrier Island), Motuihe, Kawau, Motukorea (Brown's Island), Pakatoa, Tiritiri Matangi, Waiheke,
Nunavut's Baffin Island is the largest island in Canada and the fifth largest island in the world.
Baffin Island.
Greenland is the largest island in the world at 840,000 square miles (2,175,590 km2).