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Make an adventurous descent inside the remains of Iceland’s dormant Thrihnukagigur volcano during this 5-hour, 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 just 15 guests, also includes all necessary safety equipment and round-trip hotel transportation.


  • 5-hour 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 15 people

Recent Photos of This Tour

What You Can Expect

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

Descend inside a volcano's crater in an open elevator

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 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.

After 30 minutes of driving you’ll 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 for 2 miles (3km), 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 will lower you into the site.

Enjoy the incredible views as you descend, observing the crater’s walls formed many thousands of years ago. Soon you’ll 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’ll 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 spending around 30 minutes in the crater, return back to your vehicle, which will drop you at your Reykjavik hotel.

Customer Reviews


5 star rating: Highly Recommended February 2017

Only one word for this one, Excellent! My fist trip in Iceland and it did not disappoint. The guide was fantastic and views, exhilarating. Highly recommend! Got great pics too which is always a bonus.

Diana W

5 star rating: Highly Recommended October 2016

Fantastic, Very Special and just Magical, we loved this tour and would recommend it to anyone


5 star rating: Highly Recommended October 2016

What an amazing experience! I was so nervous about doing this but the walk to the volcano was pretty easy and the descent was not at all scary! I would do this again in a heartbeat!

Rachel B

5 star rating: Highly Recommended October 2016

Worth every cent. The guides where very patient with me as I walked slower than the rest of the group. I chose a pick up and return to hotel tour Descent into Thrihnukagigur Volcano and Hike which I booked via Viator prior to leaving my home country. The tour only operates 15th May to 30th September and is an all day adventure. I was picked up from my Reykjavik hotel at 9.30am and transported to the bus depot where you are connected with another bus to take you to base camp. Once at base camp you are fitted out if you wish with rain coat and pants .It is then off to the volcano about a 40min level but sometimes rocky hike. There is a defined trail to follow a guide will be in front as well as a guide at the back of the pack. On route the lead guide that I had was pointing out things of interest like the fault in the earths crust that you actually walk across via a bridge and can see. Upon arrival at the hut you are offered soup tea coffee etc after which you are outfitted with helmet and safety harness and off up the hill to the entrance of the volcano. Once at the top a window cleaners cage awaits you. You are hooked up and lowered inside the volcano. Hold your breath and be ready to be surprised but remember to take those photos. After being lowered to the bottom and you exit the cage you are instructed where you can and cannot go. There is a path of sorts marked with red top painted sticks seems to be how things are marked and guided through Iceland one side goes 30 metres to the bottom and one goes 80 metres to the bottom but both go in a circuit and you end back where you started. You are given about an hour to explore alone. Be warned very very rocky and only your headlamp and internal lighting to guide you. After marvelling at the fact that you are inside a volcano and nothing like Jules Verne Journey to the Centre of the Earth and observing all the colours and majestic of it all it is time to ascend the volcano. So strapped up again and this time up yo

Jacqueline T

5 star rating: Highly Recommended October 2016

Most wonderful unique experience. Would recommend to everyone.

Miss H

5 star rating: Highly Recommended September 2016

It is the correct use of the word 'AWESOME'. Amazing trip and worth every Krona. Great guides and felt super safe with our Mountain Rescue guide who worked the Elevator that takes you down. Ragga was a great guide too. Loved the walk in and out to the Three Peaks. AND the ladies in Basecamp make a magnificent soup. As they say - just DO IT


5 star rating: Highly Recommended September 2016

Really worth doing. Although pace was quite quick given the very wet and windy conditions, the terrain was quite flat although rocky and steep/slippery in some places. Overall I would highly recommend doing this tour.

Callie S

5 star rating: Highly Recommended September 2016

Once in a lifetime experience! Completely worth the cost of the trip. Just breathtaking inside the volcano.

Yazeed Y

5 star rating: Highly Recommended September 2016

This was a great experience. A rare opportunity which shouldn't be missed!

Tom L

5 star rating: Highly Recommended September 2016

Amazing journey into the magma chamber. One of a kind experience and should not be missed.

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