Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124

Discover Terceira's volcanic wonders on this 4-hour guided geotour, visiting Algar do Carvão, Furnas do Enxofre, and Gruta do Natal with expert guides.


This half-day geotour offers an up-close look at some of Terceira Island’s most stunning volcanic features. With a focus on volcanoes, lava tubes, and fumaroles, the tour provides a fascinating insight into the island’s fiery formation. It’s a perfect fit for geology enthusiasts or curious travelers eager to see volcanic landscapes beyond surface views.
The tour is led by an expert guide who explains what makes Terceira’s geological formations so exceptional. Visitors are picked up from their lodgings in Angra do Heroísmo, making this a convenient option to explore the island’s volcanic side without the hassle of planning transportation.
While the experience is packed with memorable sights, it’s important to note that Algar do Carvão involves around 300 steps without an elevator. This makes the tour less suitable for pregnant women, people with mobility impairments, or claustrophobes. The tour balances awe-inspiring sights with practical considerations, making it ideal for active, curious travelers.
Planning more time in Sao Miguel Island? We've covered other experiences worth considering.


The first stop is Algar do Carvão, a famous inactive volcano that visitors explore from the inside. The guide leads you through around 300 steps into the volcanic cavity, where you see a small lake and impressive geological formations. This site offers a rare opportunity to stand inside a volcano, with its towering walls providing a sense of scale and natural beauty.
This site is known for its spectacular volcanic features and is frequently highlighted as a tour highlight. Visitors should wear comfortable clothes suitable for walking and climbing, as there is no elevator access. The experience provides vivid insights into the volcanic processes that shaped Terceira.

Next, the tour visits Furnas do Enxofre, a narrow strip of land where around 20 fumaroles release white vapor into the air. These fumaroles create a mystical atmosphere, with their bubbling activity and the smell of sulfur adding to the volcanic ambiance.
This site also offers the chance to observe native flora like Azores juniper and Azores blueberry thriving amid the volcanic landscape. The fumaroles are a visual highlight, showcasing active volcanic phenomena while providing a contrast to the inactive Algar do Carvão. The site is easily accessible with minimal walking required, making it a comfortable stop.
More Great Tours Nearby
The final exploration point is Gruta do Natal, a lava tube system filled with spectacular volcanic formations. This underground cave offers a fascinating view of volcanic geology and is considered a highlight for those interested in the island’s volcanic activity.
Walking inside the lava tube involves navigating through tight spaces and observing intricate volcanic structures, giving a glimpse into how lava flows create tunnels beneath the surface. The tour emphasizes the geological significance of the cave and its role in the island’s volcanic history.

The tour includes pick-up from lodgings in Angra do Heroísmo, making it easy to join without extra planning. It is organized as a small group with a limit of 8 participants, fostering a more personalized experience.
Travelers can choose between a shared group or private tour, depending on their preference for intimacy or social interaction. This flexibility allows for a more tailored visit, especially for those seeking a quieter or more private exploration.

Guides are praised for their friendly, professional, and highly knowledgeable approach. Reviews highlight the ability of guides to explain volcanic formations clearly, making complex geology accessible and engaging.
Some guides go beyond the basic itinerary, offering extra insights or detours, enriching the experience. The guides’ enthusiasm and expertise are often noted as the tour’s biggest strength, helping visitors appreciate the volcanic landscapes on a deeper level.
While the tour offers incredible sights, it involves walking inside caves with around 300 steps at Algar do Carvão. Visitors should wear comfortable clothes suited to outdoor and cave conditions.
The tour is not suitable for pregnant women, those with mobility impairments, or people with claustrophobia. It requires a reasonable level of physical fitness due to the steps and indoor cave navigation.

This half-day geotour stands out for its focus on volcano interiors and volcanic formations, offering a more hands-on geological experience than some other options. It complements other tours like caves and craters excursions or full-day island explorations.
While similar experiences are available, this tour’s emphasis on inside-the-volcano visits and the inclusion of fumaroles and lava tubes make it particularly appealing for those passionate about geology or natural landscapes.
Guests can reserve without immediate payment, with the option to cancel up to 24 hours in advance for a full refund. The tour’s price is competitive for its duration and the exclusive access to key volcanic sites.
This flexibility is ideal for travelers with dynamic plans or those hesitant to commit upfront. The live guides speak both English and Portuguese, ensuring clear communication during the experience.
This 4-hour volcanic adventure delivers an enriching look into Terceira Island’s geological marvels. The visits to Algar do Carvão, Furnas do Enxofre, and Gruta do Natal showcase a variety of volcanic features, from inactive craters to active fumaroles and lava tunnels.
The knowledgeable guides bring the sites to life, making complex geology accessible and engaging. The small-group format and flexible booking options add to the appeal, providing an intimate and convenient experience.
This tour is especially suited for those with an interest in volcanoes, geology, and natural landscapes who don’t mind some walking and climbing. It offers a unique inside look at Terceira’s fiery origins, making it a memorable part of any Azores trip.
Is the tour suitable for children?
The tour involves walking inside caves with many steps and some tight spaces, so it may not be ideal for very young children or those needing assistance.
What should I wear for the tour?
Comfortable clothes are recommended, especially sturdy shoes suitable for walking and climbing. No high-heeled shoes are allowed, and be prepared for potentially cool cave temperatures.
Can I cancel the tour if my plans change?
Yes, you can cancel up to 24 hours in advance for a full refund.
Are the guides bilingual?
Guides speak English and Portuguese, ensuring clear explanations for a diverse group.
Is the tour accessible for people with mobility issues?
No, due to the steps and cave conditions, it is not suitable for those with mobility impairments or claustrophobia.
What is the group size limit?
The tour is limited to 8 participants, providing an intimate experience.
How long does each site visit last?
The entire tour lasts about 4 hours, with visits to three main volcanic sites.
Does the tour include transportation?
Yes, pickup from lodgings in Angra do Heroísmo is included in the tour.