Culebra lies in a mini-archipelago of 24 chunks of land, rocks and cays, has miles of shoreline, and lots of healthy sea life and coral formations. Which makes for what is arguably some of the best snorkeling available in Puerto Rico. Much of the island has been designated a wildlife refuge by the U.S. Fish and Wildlife Service. The refuge is one of the most important turtle-nesting sites in the Caribbean. Underwater, expect to see stingrays in the sandy areas, turtles, and loads of fish and corals of all types. Visibility depends on the sea and weather conditions, but there is usually great underwater viewing.
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