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 Isla Caja de Muertos (Coffin Island), PR    
Lighthouse accessible by ferry.A hike of some distance required.
Description: There are a few explanations of how Isla Caja de Muertos, or Coffin Island, got its name. The shortest and perhaps least interesting one is that a French Explorer thought the outline of the island resembled a coffin on a table, but a more dramatic tale involves the 19th-century Portugese pirate, Jose Almeida. Almeida became enamored of a Basque lady in Curacao, married her, and took her off to sail the seas. Tragically, the new bride refused to remain below decks during her first raid experienced aboard the pirate ship and was killed by gunfire. Almeida sealed his bride’s embalmed body in a glass box, protected by a copper coffin that he placed in a cave on a deserted island near Ponce. Each month, Almeida would return to the island, pay his respects to his true love, and leave a part of his newly acquired treasure with her. Years after the pirate Almeida was executed in Puerto Rico for his plundering, a Spanish engineer gave Coffin Island its name after discovering the cave containing the coffin of Almeida’s wife.

Isla Caja de Muertos Lighthouse
Photograph courtesy U.S. Coast Guard
Coffin Island and the rest of Puerto Rico was wrested away from Spanish control in 1898 by the United States, and shortly thereafter the Lighthouse Board recorded the following description of the Muertos Island Lighthouse in its annual report.

This light-station is on the summit and in the center of Muertos Island. The light is fixed white, varied by a white flash every three minutes, is of the third order, is 297 feet above high water, and is visible for 18 miles. It is shown from a cylindrical tower on the center of a one-story, flat-roofed dwelling, which is gray with white trimmings. The tower is 41 feet high from its base. The light was begun in 1882 and was finished in 1885 by the Spanish, at a cost of 39,412 pesos, and it is used as a guide along the southerly coast of Porto Rico. The lamp and clockwork of the lens were repaired, a new cover was fitted to the cistern, the windows were repaired, the walk around the building and exterior and interior walls were cemented and the lens clock was repaired.

The I-shaped Muertos Island Lighthouse is unique amongst the lighthouses of Puerto Rico. The main entrance is located in the middle of the vertical portion of the I, which runs east-west, and opens into a small corridor across from which is located the entrance to the base of the tower. Positioned on the opposite side of the tower is an oil room, while to the right of the tower as one enters the lighthouse is an engineer’s room and to the left of the tower a supply room. In the top and bottom portions of the I, which run north-south, are found two keeper’s apartments, each consisting of a living room, two bedrooms, a kitchen/dining room, and a bathroom.

A spiral stairway leads up the cylindrical tower to a lantern room in which was housed a third-order Fresnel, equipped with three flash panels and manufactured in France by Sautter, Lemonnier, & Cie. A clockwork mechanism, powered by a weight suspended in the central column of the stairway, revolved the lens to produce a distinctive flash pattern.

Alfonso Sanchez Bermudez’s service at the Muertos Island Lighthouse is documented in several sources. The U.S. Commerce reports of 1917 record that Bermudez was commended for his bravery displayed while rescuing a sailor off the sailboat Juanita from drowning. During the earthquake, which struck the northwest coast of Puerto Rico in 1918, Keeper Bermudez noted that roughly an hour after the earthquake struck, the sea receded and then returned at Coffin Island, covering about 15 meters of beach above the normal shoreline. This surge was much less than that which caused damage at the Point Borinquen Lighthouse. In its section on Saving of Life and Property, the Annual Report of the Commissioner of Lighthouses for 1922 recorded that Bermudez had rendered first-aid to a wounded laborer until a physician’s services could be secured. Finally, in 1926, the Lighthouse Service Bulletin noted that during the tropical hurricane that struck Puerto Rico on July 22 of that year Keeper Bermudez "sheltered 7 persons from the shipwrecked fishing boat Pluma del Mar and also took in 20 persons, including 12 children, living near the station in houses unroofed by the storm."

In 1945, a 500mm lens was placed in the lantern room of the Coffin Island Lighthouse, the light was automated, and the structure boarded up.


  • Head: Antonio D. Jesus (1916 - at least 1941), Juan Ramos Ferran (1942 - 1946), Pedro P. Roldan (1946 - 1947).
  • Assistant: Jose P. Castillo (1907 - 1911), Antonio D. Jesus (1916 - 1926).

Photo Gallery: 1 2 3 4


  1. “Isla Caja de Muertos Light,” Kevin Murphy, Historic American Engineering Record, August, 1984.

Location: Located atop Coffin Island, situated roughly five miles offshore from Ponce.
Latitude: 17.893
Longitude: -66.521

For a larger map of Isla Caja de Muertos (Coffin Island) Lighthouse, click the lighthouse in the above map or get a map from: Mapquest.

Travel Instructions: Island Venture makes a trip to Coffin Island on Saturdays and Sundays and can be reached at (787) 842-8546.

The lighthouse is owned by the U.S. Coast Guard. Grounds open, tower closed.

Find the closest hotels to Isla Caja de Muertos (Coffin Island) Lighthouse

Notes from a friend:

Kraig writes:
In 1986, the Aurora Lodge Number 7 of Ponce, Puerto Rico placed a monument on Coffin Island to mark the place where local Masons first met. The inscription on the monument reads (according to my translation): “Due to the persecution of the Spanish government at that time, Aurora Lodge Number 1 (today’s Aurora Lodge Number 7) was established on Coffin Island on April 12, 1871 with its founder and first venerable maestro José Rafael Alomar Famania.” The secretive nature of the Masonic rituals led Spanish authorities to suspect the early Masons of subversion. Ten Masons from Ponce thus met secretly on the island for several years until in 1887, a government decree recognized the masons and allowed them to meet openly.

See our List of Lighthouses in Puerto Rico

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Pictures on this page copyright Kraig Anderson, used by permission.