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Discover Iceland’s underground world with a guided lava tunnel tour in Leidarendi Cave. Explore formations, touch 2,000-year-old lava, and enjoy expert-led caving.
Exploring Iceland’s volcanic landscape isn’t just about towering waterfalls or glaciers — beneath the surface lies a captivating world of lava tunnels, and the Leidarendi Cave tour offers a fantastic glimpse into this underground universe. This guided experience combines adventure, geology, and a touch of mystery, making it a must for those curious about Iceland’s volcanic past.
What truly sets this tour apart is the knowledgeable guides who bring the lava formations to life and ensure a safe, informative journey. We love that the tour is designed to be accessible, offering an easy yet fascinating underground adventure. On the flip side, some travelers might find the walking and crawling a bit tight if they’re not comfortable with confined spaces or hunching over for extended periods. Overall, it’s best suited for active travelers with an interest in geology and adventure seeking.
Whether you’re a geology buff, a thrill-seeker, or simply someone eager to see Iceland’s landscape from a different angle, this tour offers an authentic, hands-on experience you’ll likely remember for years.


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For a reasonable $101 per person, this tour provides all essential gear, including helmets and headlamps, which are critical for safely navigating the pitch-black tunnels. The experience begins with a convenient hotel pickup, which is especially helpful if you’re staying in Reykjavik’s city center. You’ll be picked up from designated bus stops, with timing varying slightly depending on the season — from around 12:45 to 14:00.
Once you’re on board, the small group size (limited to 8 people) ensures you get plenty of attention and can ask questions freely. The guides, like Louis who’s praised for his geology knowledge, make the experience engaging and educational. They also keep safety a top priority, which is reassuring when you’ll be walking, crawling, and sometimes hunched in narrow passages.
Leidarendi, approximately 900 meters long, is a relatively accessible lava tunnel for most visitors. You’ll walk about 150 meters towards The End of the Road, where the cave’s stunning formations are on full display. The cave is formed by lava more than 2,000 years ago, so touching the ancient rock is like holding a piece of Iceland’s volcanic history.
The interior features stalactites and drip stalagmites — mineral formations that grow over centuries — creating a surreal landscape that’s both fascinating and beautiful. As one reviewer noted, the guide’s geological expertise made the experience even more special, turning the underground space into a real-life science lesson.
While the cave is generally easy to access, it’s important to be prepared for some hunching and crawling, especially in tighter spots. However, the tour is designed to be approachable for most active individuals. If you’re concerned about mobility, it’s worth noting that this experience isn’t suitable for those with significant mobility impairments.
One of the most memorable aspects of this tour, as highlighted by reviews, is the chance to touch the lava formed over 2,000 years ago. This tactile experience connects you directly to Iceland’s volcanic past, making the journey not just visual but also physical and personal.
Guests consistently praise the guides for their knowledge and friendliness. Ashley mentioned, “the tour guide was very knowledgeable and we enjoyed this unique experience,” while Judi highlighted “excellent communication during pick-up and the tour itself.” It’s clear that the guides go above and beyond to make the underground adventure both educational and enjoyable, with some even customizing the experience if the group size allows.
Given the underground nature of the tour, packing the right gear is essential. Hiking shoes are a must, as the terrain can be uneven. A water bottle and rain gear should also be in your bag, especially if the weather is unpredictable, as a waterproof jacket is recommended during the walk into the cave. Gloves are suggested to help with crawling and climbing, and a camera allows you to capture the extraordinary formations.
You can rent a GoPro camera if you want high-quality photos or videos of your adventure, which is a nice touch for those wanting to remember every detail. Remember, no luggage or large bags are allowed inside, and short skirts or high heels are discouraged for safety reasons.
The tour lasts about 3 hours, giving you enough time to explore without feeling rushed. The availability of start times is flexible, with seasonal variations in pickup. The full cancellation policy (up to 24 hours in advance) adds peace of mind if your plans change unexpectedly.

For $101, this tour offers an immersive, hands-on experience of Iceland’s volcanic history. The inclusion of expert guides, all equipment, and hotel pickup makes it a convenient package. The small group size ensures a personal touch, and the opportunity to touch ancient lava and see formations first-hand makes this not just a sightseeing tour but a memorable, tangible connection to Iceland’s geological story.

This experience is perfect for adventure lovers, geology enthusiasts, and travelers who enjoy small-group tours with rich, personalized insights. It’s suitable for those who don’t mind getting a bit muddy, crawling, or hunching in confined spaces — active travelers who seek authentic experiences. It’s not suitable for people with mobility issues or those uncomfortable with tight, dark spaces.

The Leidarendi Cave tour combines adventure, education, and authenticity in a way that few underground excursions can match. The guides’ expertise and friendly approach make the experience accessible and engaging. The chance to touch 2,000-year-old lava and explore stunning formations in a safe, well-organized setting makes this a standout activity in Reykjavik.
While it involves some physical effort and confined spaces, the overall value for the price is high. You’ll walk away with not just photos but stories of Iceland’s volcanic past that will linger long after your trip ends.
If you’re looking for a unique, small-group adventure with a knowledgeable guide and an eye-opening look beneath Iceland’s surface, this tour is well worth considering.

Is transportation included?
Yes, hotel pickup and drop-off are included, making it easy to join the tour without worrying about logistics.
Do I need special clothing?
Yes, be sure to wear hiking shoes, bring rain gear, and consider gloves. Dress according to the weather and prepare for some crawling and hunching.
How long is the tour?
The tour lasts approximately 3 hours, including transportation and exploration time.
Is the cave accessible for everyone?
Not quite. The tour involves walking and crawling in confined spaces, so it’s not suitable for those with mobility impairments.
Can I take photos inside the cave?
Yes, you’re encouraged to bring a camera or rent a GoPro for capturing the formations and your underground journey.
What is the maximum group size?
Limited to 8 participants, ensuring a personal experience with plenty of guide interaction.
Embark on this underground adventure if you want to see Iceland’s volcanic history up close, touch 2,000-year-old lava, and learn from passionate guides. It’s a story of fire and rock that’s best experienced firsthand, and this tour makes it accessible, fun, and memorable.