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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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Safety measures
icon5 to 6 hours  (approx.)
Pickup from select hotels
Mobile ticket
iconOffered in: English

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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

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This activity will end right where it started.Pick-up is offered from most hotels and guesthouses in the capital area, as well as from cruise ports. Pick-ups from hotels in the city center are not possible from directly in front of the hotel due to traffic restrictions, instead passengers must come to the nearest bus pickup point. These pick-up points are the following: Bus Stop 1 - Ráðhúsið / City Hall Bus Stop 2 - Tjörnin / The Pond Bus Stop 3 - Lækjargata Bus Stop 4 - Miðbakki Bus Stop 5 - Harpa Bus Stop 6 - Safnahúsið / Culture House Bus Stop 8 - Hallgrímskirkja Bus Stop 9 - Snorrabraut Bus Stop 10 - Hlemmur Bus Stop 11 - Austurbær Bus Stop 12 - Höfðatorg Bus Stop 13 - Rauðarárstígur Bus Stop 14 - Skúlagata
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
You can cancel up to 24 hours in advance of the experience for a full refund.
  • For a full refund, you must cancel at least 24 hours before the experience’s start time.
  • If you cancel less than 24 hours before the experience’s start time, the amount you paid will not be refunded.
  • Any changes made less than 24 hours before the experience’s start time will not be accepted.
  • Cut-off times are based on the experience’s local time.
  • 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.

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Traveler Tips

  • "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." See review

Reviews by Viator travelers.  We perform checks on reviews


84 Reviews
2 stars

Reviews by Viator travelers

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Showing 1-10 of 84 reviews
Amazing experience - horrible weather
, Aug 2022
Once inside the volcano it was awesome! The Death March across the lava field on the way back was miserable. Cold, high winds, rain going sideways, low visibility, eyeglasses a mess, waterproof boots and gloves failed - no fun. But I would do it again! Better food options at the base camp would be an improvement. Going out to the restroom was no fun either.
Beautiful experience
, Aug 2022
This experience was AMAZING! The colors in the volcano were phenomenally beautiful and this was truly a onxe in a lifetime experience. The hike up there was OK - there is no pressure to do it quickly, which is nice. The soup and cocoa were also nice touches.
A great experience
, Aug 2022
I took my daughter who is 8 as a father/daughter experience. The guide Unnur was awesome and fed us geological information the whole trip (above and below ground), with assistance from Oli. The hoist operator and base camp ladies were also awesome. The experience is beyond words and a memory that my daughter and I will always share. Thank you.
100% Worth it!!
, Aug 2022
Totally worth the price!! A once in a lifetime adventure. Be ready with warm clothing - layers for the win!
1 traveler found this review helpful
Amazing experience
, Jul 2022
What an amazing experience! My son and I truly enjoyed this hike which was a few miles. Although it was rainy, they give you long, rubber raincoats that keep you dry. The tour was well organized, and it was fascinating to go inside a volcano. After the volcano, they serve traditional meat soup, hot chocolate or coffee. Wonderful tour!
Must do on a trip to Iceland!!
, Jul 2022
Our tour guides Gummy and Vaka were great! This was a once n a life time excursion. Beautiful country side walk. A unique experience. Highly recommend it. We even left our cell phone and they brought it back to our hotel. The soup was also delicious.
Wear waterproof shoes!!!
, Jul 2022
Inside the Volcano team made our tour exceptional! We hiked through very rainy, windy conditions to a warm & cozy outpost. Gummi and all the tour guides were friendly & knowledgeable. Locally cooked lamb meat stew was delicious & welcome after our hike.
Should warn about weather distance of hike driver should stop you off where you were picked up
, Jul 2022
The guide was great and caring it was cool but not what we expected . Dress for the weather. The soup was very good
STUNNING tour with AMAZING guides!
, Jul 2022
The tour was unlike anything else! This is the only place in the world to go down into a volcano, so I highly recommend. You won’t regret it if you book it. They give you some warm drinks and delicious meat soup to get you ready for the hike back to the bus. Also, when we went, they had a baby arctic fox at the base camp that we all sat around and watched. Side note: When they say the hike out to the base camp and back is for a moderate fitness level, they mean it. The hike is roughly 45 minutes each way with the hike closest to the volcano being the most strenuous. Your legs and feet will be aching, but it is totally worth it.
Went on the trip with...
, Jul 2022
Went on the trip with some elderly friends from Texas and they were overwhelmed by how friendly and professional the staff people were. I appreciated how helpful and courteous the guides were during the hike to and from the volcano. A quality experience.
Stunning once in a life time of experience.
, Jun 2022
This is a stunning experience. I can’t think of anywhere else in the world you can have a similar experience. Short comfortable hike even for our 10 yr old. Along the way the enthusiastic guide shares information of the lava flows and some Icelandic history. At the base camp you can recharge with coffee or hot chocolate. Then the real fun starts. Short steep hike up to the top of the volcano, and then, into the volcano. Inside it is just stunning, you can get a glimpse of what happens during a volcanic eruption. All the small details are well explained by the guides. It is well lit so you can get a very good view of the entire lava tube. The colours attributed to various minerals present when the lava was molten. Highly recommended for all ages.
, 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.
1 traveler found this review helpful
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!
1 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.
1 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.
1 traveler found this review helpful
A truly unique experience - I dont know...
, 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.
2 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.
1 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.
2 travelers 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!!!
1 traveler found this review helpful

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