Buck Island Reef National Monument is most notable for its coral reef ecosystem and the small tropical island that it encircles. The Monument supports a large variety of terrestrial and marine plants and animals, including endangered and threatened species. Its biological diversity and complexity affords outstanding opportunities for approved recreational activities, public education, and scientific research. Buck Island’s elkhorn-coral barrier reef is unique within U.S. waters. The Monument is host to several Threatened and Endangered species, and contains significant evidence of human use on land and in the water over thousands of years.