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Discover Terceira Island’s underground caves and volcanic sites on this half-day tour for $46.51. Includes visits to Lagoa das Patas, Sulfur Furnas, and Biscoitos.
This Underground Van Tour on Terceira Island offers a fascinating look at the island’s volcanic landscapes and underground caves, all in about 3 hours for $46.51 per person. Recommended by 99% of the 134 reviews, this tour is praised for its knowledgeable guides, stunning scenery, and variety of stops. It departs at 2:00 pm and includes pickup, drop-off, and a comfortable air-conditioned vehicle. While entry tickets to the caves cost €15, the rest of the stops are free, making this a great value for those interested in geology, nature, and volcanic history.
The tour is suitable for most travelers, with most able to participate, and offers group discounts for larger parties. It’s a half-day adventure that balances outdoor exploration and photo opportunities with educational insights provided by guides who are consistently praised for their enthusiasm and expertise. The only notable limitation is the temporary closure of Algar do Carvão for reconstruction, replaced by a visit to the natural pools of Biscoitos.


The tour begins at the Lagoa das Patas, a secret, lively spot where visitors can see the stream originating from Serra de Sta Bárbara. This natural leisure area features crystal-clear waters and the chance to interact with ducks and birds, creating a peaceful start to the journey. The 20-minute stop is perfect for photos and soaking in the fresh mountain air.
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Next, the tour visits Gruta do Natal, a famous lava tunnel where visitors can walk through mother Nature’s underground craftsmanship. The Lagoa do Negro is nearby, providing a striking volcanic landscape. This stop lasts about 25 minutes, offering a close-up view of volcanic formations. It’s worth noting that admission tickets for the caves are €15 and are not included in the tour price.

The Furnas do Enxofre site lets visitors see multiple outlets of volcanic gases with varying temperatures. The pedestrian trail allows for a close-up look at sulfur smoke, offering a sensory experience of the island’s volcanic activity. This 20-minute stop is free and highlights the dynamic processes shaping Terceira.

A mandatory highlight is the Biscoitos natural pools, where crystal-clear waters lap against volcanic rock formations. This scenic spot provides a unique landscape perfect for photo-taking and relaxing, lasting around 20 minutes. The natural pools are free to visit and are considered one of the most beautiful views on the island.

Guides like Amélia and James receive high praise for their enthusiasm, knowledge, and warmth. They share detailed information about volcanic formations, local geology, and natural history, making each stop informative and engaging. The small group size of up to 16 travelers ensures a personalized experience, with guides often conducting tours in multiple languages.

Pickup and drop-off are included, making the tour convenient for visitors staying across Terceira Island. The use of an air-conditioned vehicle keeps comfort a priority during the short drive between stops. The tour departs at 2:00 pm, suitable for travelers who want to explore in the afternoon, and the most booking occurs 13 days in advance.

What makes this half-day underground tour particularly appealing is its diverse itinerary, combining natural beauty, volcanic landscapes, and underground caves. Despite the temporary closure of Algar do Carvão, the natural pools of Biscoitos serve as an excellent alternative for spectacular volcanic scenery.
Many reviews emphasize the expertise and friendly nature of guides like Amélia and James, whose passion for geology and local culture shine through. The stops are well-paced, allowing ample time to explore and enjoy each site, making this tour ideal for geology enthusiasts, nature lovers, and families alike.

With a stellar 5-star rating, this tour offers great value and a comprehensive look at some of the most impressive volcanic and underground sites on Terceira Island. It balances educational content with relaxing scenery, all delivered by guides known for their enthusiasm and expertise.
While the caves’ entry fee is not included, the overall experience remains highly praised, especially for its stunning views and personalized service. Travelers interested in volcanology, nature photography, or outdoor adventures will find this tour well worth the time and money.
“Emelia was a wonderful tour guide and showed us some really beautiful places in the mountains around the island. Algar do Covao was a highlight, an…”
What is the cost of this tour?
The tour costs $46.51 per person, with additional cave entry tickets costing €15.
How long does the tour last?
It lasts approximately 3 hours, starting at 2:00 pm.
What locations are included?
Stops include Lagoa das Patas, Gruta do Natal, Furnas do Enxofre, and the Biscoitos natural pools.
Is transport provided?
Yes, pickup, drop-off, and air-conditioned transport are included.
Are the caves open for visiting?
The Algar do Carvão is temporarily closed for reconstruction and replaced with a visit to Biscoitos pools.
Who are the guides?
Guides like Amélia and James are praised for their knowledge, enthusiasm, and friendly approach.
Is this tour suitable for children?
Yes, it’s appropriate for most travelers, including families, as long as physical requirements are met.
How do I book this tour?
Most bookings are made about 13 days in advance, and the tour has a maximum of 16 travelers.
Can I cancel if my plans change?
Yes, free cancellation is available up to 24 hours before the start.
What should I bring?
Comfortable shoes, especially for walking through lava tunnels, and possibly water-resistant footwear for the lava caves.
Is food or drink included?
No, food and drink are not included in the tour.
What makes this tour different from other volcanic tours?
Its focus on underground caves, volcanic gas outlets, and natural pools, combined with small group sizes and expert guides, sets it apart on Terceira.