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Mona, Puerto Rico

Location of Mona

Located in the Mona Passage between Puerto Rico and the Dominican Republic, Mona Island is one of Puerto Rico's most remarkable natural and archaeological treasures. Approximately 45.7 miles (73.5 km) from Puerto Rico's western coast, the island covers roughly 21 square miles (54 sq km). Although geographically closer to the Dominican Republic, Mona's history has been closely tied to Puerto Rico.

Administratively part of Mayagüez, Mona is an isolated limestone island characterized by dramatic cliffs, coastal plains, caves, dry forests, and coral reefs. Together with nearby Monito, it forms part of the Mona and Monito Natural Reserve, managed by Puerto Rico's Department of Natural and Environmental Resources (DRNA).

Mona has no permanent civilian population. Its protected status, ecological sensitivity, and remote location make access limited and subject to authorization.

Discovered by Christopher Columbus in 1493, the island was later visited by Ponce de León in 1508. In 1511, Columbus' son, Diego, granted the island to his younger brother Bartolome.

Mona Island, photo by Departamento de Recursos Naturales y Ambientales
Photo by Departamento de Recursos Naturales y Ambientales

Why Visit Mona Island?

For those seeking a true off-the-grid adventure, Mona Island offers an unparalleled natural experience. From its untouched beaches and ancient cave art to its endangered wildlife and vibrant marine ecosystems, Mona remains one of Puerto Rico's most remarkable and protected treasures.

A trip to Mona is not just an escape, it's an expedition into a world unlike any other in the Caribbean.

A Glimpse Into Mona's Rich History

Mona Island holds significant historical and archaeological value, with Taino remains, petroglyphs, pictographs, and artifacts still present. Among the historical relics found on the island are:

> The island was historically known as Amoná, a name associated with its Indigenous inhabitants. Christopher Columbus landed on Mona during his second voyage in September 1494. Juan Ponce de León also visited the island in the early sixteenth century.

During the colonial period, Mona served as a stopping point for ships traveling between Puerto Rico and Hispaniola. Its isolated location also made it useful for shelter, fishing, and maritime activities.

Taíno Heritage and Archaeological Sites

Mona is especially significant for its caves, which preserve Indigenous petroglyphs, pictographs, and other archaeological evidence. These sites offer important insights into Taíno ceremonial practices, daily life, and relationships with the natural environment.

Archaeologists have documented ancient settlements, stone artifacts, and cave markings that illustrate the island's role in Caribbean history. Some caves also preserve evidence of later colonial encounters.

These cultural resources are fragile and protected. Visitors must not touch rock art, remove artifacts, or enter restricted archaeological areas.

Guano Mining and the Island's Lighthouse

During the nineteenth and early twentieth centuries, Mona's caves were commercially mined for guano, a phosphate-rich material used as fertilizer. Mining operations brought workers and temporary settlements to the island and left behind roads, equipment, and other historical remains.

Another important landmark is the Mona Island Lighthouse, or Faro de la Isla de la Mona. The iron-and-steel lighthouse was constructed during the late nineteenth century and began operating in 1900.

It guided vessels through the Mona Passage, an important shipping route between the Atlantic Ocean and the Caribbean Sea. The lighthouse was automated in 1973 and deactivated in 1976. Its surviving structure remains an important part of Puerto Rico's maritime heritage.

Island Geography & Climate

The island is about 7 miles (11.3 km) long and 4.2 miles (6.8 km) wide, with an approximate area of 13,638 acres (twice as large as Culebra); its shape roughly that of a lima bean with the concavity toward the north.

Its climate is classified as semi-arid sub-tropical, with year-round temperatures ranging from 80°F to 90F (27°C to 32°C).

The island has 200-foot cliffs riddled with caves. The highest peak is about 300 feet above sea level. There is little vegetation, although there has been some reforestation. The island has no permanent inhabitants, except by the Puerto Rico Department of Natural Resources (DNR) personnel (resident biologist and rangers).

Wildlife & Endangered Species

Mona Island is often compared to the Galápagos Islands, as it harbors unique and endangered species found nowhere else. The island is home to:

Beaches, Coral Reefs, and Marine Life

The island is surrounded by clear waters, coral reefs, and diverse marine habitats. Its beaches include Playa Sardinera, Playa Pájaros, Playa Mujeres, Playa Escalera, and other secluded coastal areas.

Playa Sardinera and Playa Pájaros have traditionally been among the locations used by authorized campers. Offshore reefs support corals, tropical fish, sea turtles, and other marine life.

Marine conditions can be challenging, and access to particular beaches or waters may be restricted to protect sensitive habitats.

Activities & Attractions


Visiting Mona Island

Visiting Mona Island requires advance planning and authorization. The island is a protected natural reserve, and recreational access is controlled by Puerto Rico's Department of Natural and Environmental Resources (DRNA).

Transportation is generally by private boat or authorized charter. There is no regular public ferry service to Mona. Sea conditions in the Mona Passage can be demanding, and trips depend on weather, permits, and available transportation.

Authorized activities may include hiking, wildlife observation, scientific visits, and camping in designated areas. Camping and other activities are subject to permits and conservation regulations. Visitors should not assume that every trail, cave, beach, or activity is open.

For current access rules, permit requirements, and visitor information, consult the Puerto Rico Department of Natural and Environmental Resources.

What You Need to Know

Map References

Land Area: 54-55 sq km (21 sq mi)
Length: Approximately 7 mi (11.3 km)
Width: Approximately 4.2 mi (6.8 km)

Coordinates: Latitude: 18.08° N   Longitude: 67.89° W



Frequently Asked Questions About Mona Island

Where is Mona Island located?
Mona Island is located in the Mona Passage between Puerto Rico and the Dominican Republic, approximately 45.7 miles (73.5 km) from Puerto Rico's western coast. It is administratively part of Mayagüez.

How large is Mona Island?
Mona covers approximately 21 square miles (54 square kilometers). It measures about 7 miles (11.3 km) long and 4.2 miles (6.8 km) wide.

Can you visit Mona Island?
Yes, but visits require advance authorization from Puerto Rico's Department of Natural and Environmental Resources (DRNA). Transportation is generally by private boat or authorized charter, and access is subject to conservation regulations and sea conditions.

What is Mona Island famous for?
Mona Island is known for its Taíno cave art, historic lighthouse, limestone cliffs, rare wildlife, sea turtle nesting beaches, and protected natural habitats.

Are there people living on Mona Island?
Mona Island has no permanent civilian population. Park personnel, conservation workers, researchers, and authorized visitors may stay temporarily.

What endangered animals live on Mona Island?
Mona is home to the endangered Mona ground iguana and Mona boa. Its beaches also provide nesting habitat for threatened and endangered sea turtles, including hawksbill turtles.

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Did You Know?

The Cuatro is the national instrument of Puerto Rico.