The refuge has diverse habitats including sub-tropical dry forests, mangroves, brush, grasslands and 22 small islands. The small rocky cays serve as temporary home to 13 species of nesting seabirds.
Laguna Cartagena National Wildlife Refuge The present lagoon is a remnant of what was once a large open expanse of water and one of the most important freshwater habitats for migratin waterfowl and aquatic birds in Puerto Rico.
The Jobos Bay Reserve is the second largest estuarine area in Puerto Rico. It encompasses a chain of 15 tear shape mangrove islets known as Cayos Caribe and the Mar Negro area in western Jobos Bay.