More than 20% of Culebra is part of a spectacular national wildlife refuge, which US President Theodore Roosevelt signed into law more than 100 years ago. Most of this land lies along Culebra's coastline and includes more than 20 cays. Containing three different ecosystems, the refuge serves as a habitat for endangered sea turtles and is also the largest seabird nesting grounds in the Caribbean. For visitors, it is a place for hiking, birdwatching and enjoying secluded beaches.
The US Fish & Wildlife Service administers these lands, some of which are off-limits to the public. Stop by the office on the eastern side of Ensenada Honda for maps and information about the refuge, its flora, fauna and hiking trails.