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Considered by many as one of the natural wonders of the world, the island of Bora-Bora is a single island surrounded by an extensive coral reef and a beautiful blue lagoon captured in the center of this low-oblique photograph. The coral reef north of Bora-Bora is Tupai Atoll. The two islands southeast of Bora-Bora - Tahaa (northern island) and Raiatea (larger southern island) - are encircled by a single coral reef system. Image courtesy of NASA.