A patchwork of cays, beaches, and headlands across some 1,500 acres of Culebra and its outlying islets, protected since 1909. The refuge shelters sea turtles (hawksbill, green, leatherback), seabirds (boobies, terns, frigatebirds), and the largest seabird colonies in the Caribbean.
Most of the refuge is closed to the public, but Flamenco, Zoni, and Culebrita all sit on refuge land and are open. There is no visitor centre on the island. Information panels at trailheads explain what you can and cannot do — no removing shells, no walking on the dunes, reef-safe sunscreen only.