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Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik

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Reykjavík, Iceland
Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik

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Free cancellation
Up to 24 hours in advance. Learn more
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Safety measures
icon5 to 6 hours  (Approx.)
Pickup from select hotels
Mobile ticket
iconOffered in: English


Make an adventurous descent inside the remains of Iceland’s dormant Thrihnukagigur volcano during this small-group excursion from Reykjavik. Traverse the surreal landscapes of Iceland’s countryside on your way to the Blue Mountains, hiking through the area’s craggy lava fields. Then follow your guide inside the geological site's immense subterranean interior, its walls still scalded from an eruption that took place 4,000 years ago. This small-group excursion, limited to 18 guests, also includes all necessary safety equipment and round-trip hotel transportation.
  • Thrihnukagigur volcano tour from Reyjavik, led by a professional expert guide
  • Travel to the Blue Mountains to descend into the dormant volcano
  • Ride an open elevator down inside Thrihnukagigur's magma chamber
  • Walk around the subterranean arena and ogle its scalded walls and dome
  • Learn about the volcano’s last eruption, 4,000 years ago
  • Walk through scenic lava fields to and from the volcanic crater
  • Receive personalized attention on a small-group tour limited to 18 people

Why Travelers Choose This Tour

Unlike other similar tours, hotel pickup/drop-off is standard, making this a hassle-free adventure from start to finish.
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Hotel pickup and drop-off
Professional guide
Helmet, harness and all necessary safety equipment
Light refreshments
Food and drinks

Departure Point

Ingólfsstræti 1, 101, 101 Reykjavík, Iceland

Return Details

Returns to original departure point
Add a dose of adventure to your Iceland visit during this small-group exploration inside the now-extinct Thrihnukagigur volcano. Outdoor lovers: enjoy this thrilling chance to climb inside a cavern formed thousands of years ago by the powerful forces of mother nature.

Begin with pickup from your hotel in Reykjavik. Then take off for a drive to Iceland’s Blue Mountains (Bláfjöll) for your volcano experience, listening to an introduction on how this unique volcanic site was first formed 4,000 years ago from your guide. As it turns out, the unique eruption allowed the formation of its magnificent magmatic chamber.

Arrive at Thrihnukagigur, taking note of the safety briefing from your guide. Then head out into the craggy formations of the volcano’s surrounding lava field. Your walk is of moderate difficulty due to the uneven ground and sharp rocky surface, so please be sure to be in good shape and to bring along good hiking shoes.

Continue your hike through the field, taking time to admire its volcanic cones and steaming gas fissures, before arriving at the rim of the crater. Listen to another short safety lesson while donning your helmet and harness, then join a group of three or four other guests on the open cable elevator that lowers you into the site.

Enjoy the incredible views as you descend, observing the crater’s walls formed many thousands of years ago. Soon, reach the base of this dormant volcano and continue on an exploration of the cavernous interior with your guide. Check out the towering rock dome above, the surface scattered with an array of colors caused by the magma that once touched its surface. You also hear a variety of stories from your guide about the last eruption, imagining this incredible site as it once was, bubbling with liquid magma.

After time inside the crater, return back to your vehicle, which drops you at your Reykjavik hotel.
Stop At:  
Inside The Volcano
On the short drive to the Bláfjöll mountain range, listen to a fascinating introduction to the Thrihnukagigur volcano — the site of your underground experience. Hear how this dormant peak last erupted 4,000 years ago, and why the nature of the explosion left the volcano with an open and accessible magmatic chamber. After roughly 30 minutes, arrive at Thrihnukagigur and after a short briefing, start out on an hour walk to its crater. The trek, while not uphill, is undulating and uneven, and only suitable for walkers with a moderate or higher level of fitness. Hiking shoes are advised. Follow your guide at a steady pace along the 2-mile (3-km) path and, as you walk, take in the surrounding lava fields dotted with volcanic cones and gas fissures. When you arrive at the crater, get another safety briefing and don the provided helmet and harness. Then, in a group of three or four other people, board the open cable elevator that lowers you down into the crater. Thrill as you descend around 400 feet (120 meters) into the throat of the volcano, passing millennia-old rock walls deep into the bowels of the Earth. At the bottom, step off the lift and explore the magma chamber with your guide. Marvel at the remarkable natural arena and take in the rock dome with its patchwork of colors created by scalding and charring. As you look around in awe, hear incredible facts about the volcano’s last eruption and imagine the chamber as it once was, filled with a seething mass of burning hot lava. After around 30 minutes inside the volcano, ascend to the surface and then walk back to your vehicle.
Duration: 5 hours 
Admission Ticket Included
Stop At:  
The mountain range where the volcano is located
Duration: 5 hours 
Admission Ticket Free
  • Confirmation will be received at time of booking
  • Wear warm and waterproof clothing, as well as hiking boots. Sneakers and jeans are not appropriate.
  • Minimum age is 8 years
  • Not wheelchair accessible
  • Not recommended for travelers with back problems
  • Not recommended for pregnant travelers
  • No heart problems or other serious medical conditions
  • Be aware that this tour includes a total of 7 km hike across an uneven mountain terrain in unpredictable weather conditions. No hiking experience is needed, but this does require moderate fitness levels.
  • Travelers should have a moderate physical fitness level
  • This tour/activity will have a maximum of 18 travelers
  • OPERATED BY Gray Line Iceland

For a full refund, cancel at least 24 hours in advance of the start date of the experience.

  • This experience requires good weather. If it’s canceled due to poor weather, you’ll be offered a different date or a full refund.

Learn more about cancellations.

The answers provided below are based on answers previously given by the tour provider to customers’ questions.
What is the policy on sanitization during Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik?
A:The policies on sanitization are:

  • Hand sanitizer available to travelers and staff
  • Regularly sanitized high-traffic areas
  • Gear/equipment sanitized between use
  • Transportation vehicles regularly sanitized
See all safety measures taken by Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik.
What is the social distancing policy during Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik?
A:The policies on social distancing are:

  • Social distancing enforced throughout experience
  • Contactless payments for gratuities and add-ons
See all safety measures taken by Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik.
What measures are being taken to ensure staff health & safety during Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik?
A:The policies on staff health & safety are:

  • Guides required to regularly wash hands
  • Paid stay-at-home policy for staff with symptoms
See all safety measures taken by Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik.
What is the maximum group size during Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik?
A:This activity will have a maximum of 18 travelers.

See all safety measures taken by Inside the Volcano: Small Group Thrihnukagigur Hike and Tour from Reykjavik.


68 Reviews
2 stars

Reviews by Viator travelers

Showing 1-10 of 68 reviews
, Aug 2021
Incredibly fun day! And what an adventure to be lowered into the throat of a dormant volcano. Very unique experience. Guides were helpful, knowledgeable, safety conscious, and to a person had a wicked and delightful sense of humor. Highly recommended.
Great Day
, Aug 2021
Inside the volcano viator agent lied to me about the pick up time, it was 7:30 and not 9:30! luckily Gray Line iceland had a free spot and they rescheduled my time to 12. Yohan was my guide and he was terrific ! i loved listening what he had to say with a huge sense of humor! gigsle was amazing as well! we eat lamb soup which was really good and enjoy a unique experience!
HelpfulHelpful1 traveler found this review helpful
To the centre of the earth!
, Aug 2020
This is a once in a life time experience! If you don't do anything else in Iceland (but of course you will) this trip has to be top of the list. The trip down into the volcano takes longer than expected and one can study the different formations and colours whilst descending in the basket. Once inside the space is cavernous and colourful. High above is the tiny entrance - make sure you have plenty of memory in camera. Alexia and her team of guides are friendly, helpful and very knowledgeable.
HelpfulHelpful1 traveler found this review helpful
Very interesting
, Sep 2019
Tour was great fun and educational. Recommend checking out National Geographic UTube on this volcano. Would also note site is quite a bit higher than Reykjavik so it's colder, windy and frequently wet. Dress accordingly, especially in non summer months.
Inside the volcano
, Nov 2018
Excellent trip. Very surreal to be inside a volcano looking up! The hike there took about an hour I guess. The lift down and up was brilliant. It felt safe and the views were fantastic. The guides were superb and knowledgeable. The equipment was all in good order. Great soup at base amp too!We’ll organised and delivered trip. My wife , son and I loved it!Thank you.
A truly unique experience - I dont know...
Richard Goody
, Sep 2018
A truly unique experience - I dont know of anywhere else in the world where you can do this. Why would you miss out?! Tour consists of a drive out to a hut at the foot of the ski slopes where you are offered an extra waterproof layer before your 3km hike across the lava field to the base camp at the base of the crater cone. Here you are offered refreshment, given instruction, split into groups of 6 and given helmet and harness before being escorted up the crater wall to the lift at the shaft opening. Enjoy the ride! 30 mins is spent at the bottom before your return trip. You are told about the history of the volcano and its formation with some explanation of the features that you see around you. It is truly impressive. Back at base camp you are offered a warming bowl of soup before your hike back to the ski slopes and back to Reykjavik. The trip is organised professionally, you are kept well informed, given clear instructions and I felt safe at all times.
HelpfulHelpful2 travelers found this review helpful
An Experience To Remember
Lisa B
, Aug 2018
it's not everyday you get the chance to hike a couple of miles to the cone of a volcano, and then get harnessed and lowered 450 feet into the magma chamber. This was a truly memorable experience, a little physically challenging (i.e. uphill, breathing hard), but well worth the effort. The crew at base camp were super friendly and served a delicious lamb stew, outfitted us with top notch gear and basically keep us safe. We had a beautiful sunny day for the hike! I'd highly recommend this excursion to anyone looking for something different, a little physical and a lot of fun.
HelpfulHelpful1 traveler found this review helpful
It's quite a hike to get to the...
, Jan 2018
It's quite a hike to get to the Volcano, but well worth it.
HelpfulHelpful1 traveler found this review helpful
H o l y. C O.W !!!! If you go...
, Nov 2017
H o l y. C O.W !!!! If you go.... You MUST do this! Amazing, speechless, stunning! To be lowered into a volcano.. u g h. !!! Yes please!!!! Wow!!! There was a short and easy 2 mile hike to get there and then some warm soup to toast you up!! This is Only Open certain times!! Well worth it!!!
Absolutely amazing. I was so...
, Oct 2017
Absolutely amazing. I was so excited for this excursion and it did not disappoint. I was always interested in rocks and volcanos as a child, so this was very special to me. The guides were excellent and safety was the top priority. The soup at base camp when we got out of the volcano was delicious
HelpfulHelpful1 traveler found this review helpful

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