Isla Caja de Muertos
An uninhabited reserve island off Ponce with a nineteenth-century lighthouse, dry forest and endemic lizards.
Updated 22 October 2026

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Coffin Island lies about eight kilometres off Ponce and has been a nature reserve since 1980, uninhabited apart from rangers. The name is usually explained by its profile from the mainland, which looks like a body laid out, though the local stories run to pirates and a preserved corpse. A trail climbs through dry forest of cactus and gumbo limbo to a lighthouse of 1887 on the ridge, with the whole southern coast and the Caribbean laid out from the top. The island holds endemic lizards and is an important nesting site for turtles and seabirds. The beach at Pelícano has clear shallow water and reef within swimming distance.
History
Stone art shows that people visited the island over millennia, and Taíno fishermen came here often. The first known map with its present name was drawn in 1842, the Spanish built the lighthouse in 1880-1887, and on 2 January 1980 the island was declared a nature reserve (Wikipedia, Caja de Muertos Island).
What's there
- The 1887 lighthouse - on the ridge, with the south coast laid out below.
- Playa Pelícano - clear shallow water and reef close to shore.
- The dry forest trail - cactus and gumbo limbo across the island.
- Endemic lizards - species found only here and on nearby cays.
When to go
December to April is drier and calmer. The ferry generally runs at weekends and on holidays only, with a fixed return time, so the visit is dictated by the boat. Numbers are capped. Turtle nesting season restricts access to some beaches.
Practical notes
The ferry runs limited days and sells out, and there is no other way across without chartering. There is no shop, no shade beyond the trees and no drinking water, so everything is carried in and rubbish carried out. The lighthouse is a ruin and cannot be entered. The crossing can be rough.
Nearby
La Guancha boardwalk in Ponce is the departure point; Ponce's old town is ten minutes.
Key facts
Source: Wikidata, item Q82988, read on 18 October 2026.
What to pack for Isla Caja de Muertos
Chosen from what this place is for. Tap a kit for the full checklist.
- Broken-in walking shoes or boots - Grip and ankle support matter more than looks; never hike in brand-new boots. Find on Amazon
- Reef-safe sunscreen - High SPF that will not bleach the coral you are swimming over. Find on Amazon
- Binoculars - The single best wildlife tool - even a compact pair transforms a sighting. Find on Amazon
- Layers + a waterproof shell - Mountain weather turns fast; a packable rain jacket saves the day. Find on Amazon
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