To protect the unique marine life here, a 10-sq-km nature reserve in the island's northeast was established in 1995. About 10% of the park's area covers a coastal mangrove system east of the airport; the remaining 905 hectares cover an offshore belt including the islets of Cayo Cangrejo and Cayo Tres Hermanos. An 800m-long ecopath helps you identify different species of mangroves and the fauna that inhabit them.