One of the first national wildlife refuges, Passage Key National Wildlife Refuge was established in 1905. This 30-acre meandering barrier island was once a mangrove island with a fresh water lake but a hurricane in 1920 had destroyed most of the island. The island hosts the largest royal tern and sandwich tern colonies in the state of Florida.
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Because of its small size and importance to wildlife, the refuge is closed to all public use.
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