Quick Fact
The Muertes Archipelago—also called Las Cinco Muertes—is five volcanic islands sitting 322 km (200 miles) southwest of Costa Rica. The biggest, Isla Sorna, covers 52 km² (20 sq mi) at 9.12° N, 87.18° W. As of 2026, no one lives there permanently, according to Costa Rican records.
Geographic Context
These islands float in the Pacific Ocean, right where the Cocos Plate grinds against the Caribbean Plate. Over 15 million years, that friction built jagged cliffs, thick jungles, and steaming vents. Remote? Absolutely. But that’s exactly why scientists love it—and why Hollywood couldn’t resist turning it into the backdrop for Jurassic Park. Its mix of isolation and biodiversity makes it perfect for studying everything from dinosaur DNA to coral reefs.
What are the five islands in the Muertes Archipelago?
| Island | Size (km²) | Coordinates | Notable Features |
|---|---|---|---|
| Isla Sorna | 52 | 9.12° N, 87.18° W | Largest island; volcanic caldera; freshwater lagoons |
| Isla Muerta | 18 | 9.01° N, 87.22° W | Densely forested; abandoned research station |
| Isla Matanceros | 12 | 9.15° N, 87.15° W | Steep cliffs; nesting seabird colonies |
| Isla Pena | 8 | 8.98° N, 87.25° W | Smallest island; rugged terrain; rare orchid species |
| Isla Tacaño | 22 | 9.05° N, 87.09° W | Central plateau; freshwater springs |
Source: Costa Rican Institute of Tourism (ICT), 2024
Environmental and Scientific Significance
- Marine Biodiversity: The surrounding waters belong to the Cocos Island Biological Reserve, a UNESCO site with over 300 fish species—think hammerheads and manta rays.
- Volcanic Activity: Isla Sorna still has hot springs and gas vents, a reminder that the volcano isn’t fully asleep.
- Endemic Species: A 2023 study by the National System of Conservation Areas (SINAC) found at least 12 plant species and 4 bird subspecies found nowhere else on Earth.
Why are the islands called “Las Cinco Muertes”?
Early maps from that era show the islands marked with warnings about deadly currents and no safe harbors. The death toll was high enough that the name stuck. It’s a grim reminder of how brutal those first voyages really were.
Have any of the islands been used for industry?
That operation never lasted long. Financial troubles forced it to close, and today you’ll only find rusted machinery swallowed by jungle. It’s a ghost of an industry that couldn’t survive the islands’ harsh realities.
How did the Muertes Archipelago become linked to Jurassic Park?
That movie turned Isla Sorna into a pop-culture icon. While no real dinosaurs roam the islands, the films sparked a wave of eco-tourism curiosity. By 2026, Costa Rica still hasn’t opened the islands to visitors, worried about both the environment and the logistical nightmare of getting there.
Is it possible to visit the islands today?
If you’re determined, your only legal route is a private boat charter from Puntarenas, but you’ll need permits from SINAC and must follow strict conservation rules. Even then, it’s an 18–24 hour slog one way, and you’ll need a satellite phone, rescue insurance, and nerves of steel. Rough seas from May to November make the trip even riskier—so unless you’re a researcher with a very good reason, it’s best admired from afar.
What’s the best time of year to attempt a visit?
That’s when the Pacific is gentler and the weather is more predictable. Outside that window—especially May through November—expect big waves and stormy skies. Honestly, even in the “best” season, this isn’t a vacation spot. It’s a place for serious expeditions only.
Are there any endangered species on the islands?
Isla Pena’s rare orchids and Matanceros’ seabird colonies are particularly vulnerable. The remoteness that protects them also makes them hard to monitor. Any disturbance could have big consequences, which is why Costa Rica keeps visitors out.
How do the islands compare in size?
Size matters here—Isla Sorna dominates everything else. That’s why it’s the only one with a volcanic caldera and freshwater lagoons. The others are smaller, steeper, and far more rugged. If you’re imagining a tropical paradise, think again. These islands are wild, untamed, and not here for tourists.
What kind of permits are required to visit?
That’s on top of chartering a boat and proving you have rescue insurance. The government isn’t handing these out lightly. They want to know exactly why you’re going, how long you’ll stay, and how you’ll minimize your impact. If your paperwork isn’t perfect, you’re not boarding that boat.
Are there any abandoned structures left from past operations?
Jungle has reclaimed most of it, but you can still spot twisted metal and broken machinery peeking through the vines. It’s a haunting reminder of human failure in a place nature always wins. No guided tours exist—just eerie silence and the occasional bird call.
What’s the most dangerous part of visiting?
One broken bone or severe illness out there and you’re on your own. That’s why satellite phones and rescue insurance aren’t just suggestions—they’re requirements. The nearest hospital is hours away by boat, and rough seas can delay even emergency responses for days. It’s not the dinosaurs you need to worry about—it’s the Pacific itself.
