Mona and Monito Islands Natural Reserve

The Mona and Monito Islands Natural Reserve is located off the west coast of Puerto Rico in the Mona Passage. Comprised primarily of the islands of Mona and Monito, this reserve protects one of the largest natural coral reef systems in the Caribbean as well as rare terrestrial habitats. Mona Island covers around 22 square miles of limestone terrain characterized by caves, cliffs, and dry forest landscapes, while the much smaller Monito Island lies just northwest and is nearly inaccessible due to its steep and rugged topography. The reserve was established to preserve unique species such as the Mona ground iguana, endangered sea turtles, and various seabird colonies including brown boobies and red-footed boobies. The surrounding waters provide world-class locations for snorkeling and diving, with clear visibility and abundant marine life including coral formations, sponges, and tropical fish. There are no formal developed trails or campgrounds on the islands, underscoring their wilderness character, but careful guided visits are possible under permit. Historically, Mona Island served as a refuge, plantation site, and navigation landmark dating back to pre-Columbian times and Spanish colonial occupation. Visitors come for the pristine natural beauty, remote beaches, and opportunities to explore caves and archaeological sites. Due to its protected status, access is limited and managed by Puerto Rico’s Department of Natural and Environmental Resources to minimize human impact and preserve fragile ecosystems. The reserve remains one of Puerto Rico’s most remote and ecologically significant protected areas.