Los Tuneles (Cabo Rosa): Exploring One of the Galápagos’ Most Unique Marine Landscapes

Off the southern coast of Isabela Island lies one of the most extraordinary snorkeling sites in the Galápagos: Los Tuneles, also known as Cabo Rosa, a place that feels almost otherworldly.

Out here, the ocean winds through a maze of ancient lava formations, creating natural arches, tunnels, and shallow lagoons where wildlife thrives. The water is calm, clear, and surprisingly full of life, from reef sharks gliding beneath lava bridges to sea turtles resting quietly on the sandy bottom. Galakiwi adventurers absolutely love visiting Los Tuneles.

It’s the kind of place where every turn reveals something unexpected: a blue-footed booby standing on black volcanic rock, a seahorse swaying gently among coral, or a group of sea turtles swimming calmly through the water.

For many of our travelers, a visit to Los Tuneles becomes one of the most memorable moments of their time in the Galápagos.

Where Are Los Tuneles Located?

Los Tuneles are located along the southern coast of Isabela Island, the largest island in the Galápagos archipelago.

The site sits about 45 minutes to one hour by boat from Puerto Villamil, depending on ocean conditions. Puerto Villamil is the small coastal town where travelers on our tours stay when visiting Isabela.

The journey itself is part of the experience. As the boat approaches Los Tuneles, the open ocean slowly transforms into a labyrinth of lava formations, with crystal-clear water and black volcanic rock shaped by ancient eruptions and centuries of erosion.

These formations create shallow channels and natural pools that shelter an incredible diversity of marine life. Navigating these waters requires experience, which is why we partner with trusted local captains who know how to safely guide boats through the rocky passages of Los Tuneles.

An important detail: large cruise ships typically cannot visit Los Tuneles. The water is too shallow and the area too fragile for bigger vessels to navigate. This is one of the advantages of land-based travel,  it allows access to special places like this that require smaller boats and a more flexible approach.

The Boat Ride Is Part of the Adventure

Even reaching Los Tuneles is an experience in itself.

The final approach involves navigating through a maze of narrow lava channels and rocky formations. This is where the skill of the captain truly matters.

On Galakiwi trips, we partner with experienced local captains from Isabela who know these waters intimately. Their knowledge allows them to guide boats carefully through the complex volcanic landscape while protecting the fragile ecosystem.

Watching them maneuver through the rocky channels is impressive and a great reminder of the value of local knowledge.

Why Los Tuneles Is So Special

Los Tuneles is unlike any other snorkeling location in the Galápagos.

Thousands of years ago, lava flowed from Isabela’s volcanoes into the ocean. As the outer layer cooled, tunnels and hollow structures formed beneath the surface. Over time, parts of these tunnels collapsed, leaving behind a network of arches, bridges, and lava platforms rising above turquoise water.

The result is a landscape that looks almost sculpted by nature.

But beyond its beauty, Los Tuneles is also an important marine habitat. The shallow waters act as a natural refuge for many species, creating one of the most reliable places in the Galápagos to encounter wildlife while snorkeling.

Because of this fragile ecosystem, the area is carefully protected and visitor access is limited.

What Marine Life Can You See at Los Tuneles?

Los Tuneles is often considered one of the best snorkeling sites in the Galápagos because of the incredible variety of wildlife that lives in its calm waters.

While every day is different, some of the species frequently seen here include:

Sea Turtles
Green sea turtles are incredibly common in this area. It’s not unusual to see several resting on the ocean floor or slowly swimming past snorkelers.

White-tip Reef Sharks
These elegant sharks often gather beneath lava ledges and tunnels during the day.

Galápagos Seahorses
Hidden among coral and algae, these tiny creatures are one of the most exciting discoveries for observant snorkelers.

Eagle Rays and Stingrays
Gracefully gliding across the sandy seabed.

Sea Lions
Curious and playful, sea lions sometimes join snorkelers for an underwater swim.

Colorful Reef Fish
Schools of surgeonfish, parrotfish, and angelfish add bursts of color to the lava reef.

Above the water, visitors can often see blue-footed boobies, pelicans, and other seabirds flying around or nesting within the intricate lava formations. It’s a place where keeping an eye out for unexpected wildlife encounters always pays off.

How Long Does a Los Tuneles Trip Take?

Most Los Tuneles excursions last about half a day.

On many Galakiwi itineraries, the experience typically includes:

• Morning departure from Puerto Villamil
• Boat ride to Cabo Rosa
• Snorkeling session
• Short guided walk through the lava formations
• Return to Isabela in the early afternoon

This timing allows travelers to enjoy the experience without feeling rushed while still leaving time to explore other parts of the island.

The Best Way to Explore Los Tuneles

Visiting Los Tuneles requires joining a guided boat excursion from Puerto Villamil. Because the area is located inside the Galápagos National Park, trips must be operated by authorized tour providers and accompanied by a certified naturalist guide.

A typical visit includes two main experiences.

Snorkeling in the Lava Channels

Travelers spend time snorkeling in the calm waters around the lava formations. Visibility is often excellent, and wildlife encounters can happen almost immediately after entering the water.

It’s always worth moving slowly and observing carefully, some of the best encounters happen when you pause and look around the small tunnels, rocks, and caves.

Walking Through the Lava Formations

After snorkeling, your Galakiwi guide usually leads a short walk across the lava formations above the water. From here, visitors can observe nesting seabirds such as blue-footed boobies and sometimes spot sharks or turtles swimming through the shallow channels below.

It’s a short walk, but an incredibly unique experience in such an unusual volcanic landscape.

How to Book a Trip to Los Tuneles

Some Galakiwi adventure tours already include a visit to Los Tuneles, while others allow travelers to add it as an optional experience.

Travelers visiting the islands with Galakiwi can easily include the excursion in their itinerary when spending time on Isabela Island. Because visitor numbers are limited and weather conditions can affect departures, it’s always a good idea to plan ahead.

Why Los Tuneles Is a Galápagos Experience Worth Prioritizing

The Galápagos Islands offer countless incredible wildlife encounters, but Los Tuneles stands out for a simple reason: it combines extraordinary marine life, dramatic volcanic landscapes, and intimate small-boat exploration in one place.

Here, the line between land and sea almost disappears. Lava arches rise above crystal-clear water, sea turtles drift quietly beneath them, and seabirds nest on the rock overhead.

It’s a reminder that the Galápagos isn’t just about seeing wildlife, it’s about stepping into an ecosystem that still feels wonderfully wild. And sometimes, the most remarkable places are the ones you reach by slowing down and exploring the islands from the shore.

Check out our tours and let’s plan how to include Los Tuneles in your trip. Email us the details of your dream Galápagos adventure, and we’ll create a personalized experience with everything you’d love to discover in the islands.