Inside The Volcano | Take a Journey to the Center of the Earth

The dormant Thrihnukagigur volcano is a unique natural phenomenon. By setting up the necessary gear and equipment, we’ve created a tour that opens the door to a new world.
Available: May - Oct
Difficulty: Moderate
Duration: 5 - 6 hours
Minimum Age: 12
Pick Up: Hotel pick-up included
Price From: ISK 44.000
Cancellation Policy: Cancel up to 48 hours in advance for a full refund
Reviews: 2 reviews

Tour Highlights

✅ Thríhnúkagígur volcano is a unique natural phenomenon
✅ Enjoy an extremely close encounter with a volcano
✅ Breathtaking scenery
✅ Hiking from the parking lot meeting point to the Volcano
✅ Expert guides
✅ No particular skills or prior hiking experience needed
✅ Free pick-up/drop-off at your hotel in Reykjavik
✅ Small groups, plenty of guides = personal experience.
✅ Traditional Icelandic meat soup, coffee/tea and perhaps some sweets as well. Vegetarians will have alternatives

“I have never been anywhere underground that matches the grandeur and impact of this place.”

– The Sunday Times

Tour Details

Operation dates: From 15 May –  15 October
Tour departures: Several departures every day. The first tour at 8:00 and the last tour in the afternoon.
Duration: 5–6 hours (about 35-40 minutes inside the volcano).
Fitness level needed: Moderate (the difficulty is 2 out of a possible 5). No knowledge of hiking or climbing is required. It’s not an uphill walk, but the surface is partly uneven. This is NOT for those in no or limited physical shape.
Distance walked: Approximately 3 km (2 miles) each way. The walk usually takes around 45–50 minutes (depending on the condition of people in the group). A guide will be with you at all times during the walk.
Minimum age limit: 12 years (we can and have made exceptions on the age. Contact us if you want to convince us that your kid is up for the adventure).
Price: ISK 44.000.

  • Pick-up at your hotel in Reykjavik.
  • All safety gear, helmets, harnesses, etc.
  • Small groups, plenty of guides = personal experience.
  • Volcano tour of a lifetime.
  • Traditional Icelandic meat soup, coffee/tea and perhaps some sweets as well. We also serve vegetarian soup.
  • Transfer back to your hotel in Reykjavík.
  • Good shoes – We recommend wearing hiking boots on the tour since the trail is rocky and can get wet and muddy on a rainy day.
  • Outdoor clothing. The weather in the mountains can be very different from the conditions in the city. It’s important for guests to realize that the weather is very unpredictable, and you should definitely bring warm, rainproof clothes with you, even if the weather in Reykjavík is nice and the forecast looks good. Not least because it’s always the same temperature inside the crater – about 3°C (37°F). That’s cold!
  • A camera. You will want to remember this trip. Yes, you can take as many pictures as you want!
  • A good spirit. This tour is all about having fun.
  • Hasn’t erupted in 4000 years
  • Total depth is 700FT (You can easily fit the Statue of Liberty in there)
  • Total ground space 160×220 FT.
  • It takes 6 minutes to lower all the way to the bottom of the crater


Thríhnúkagígur volcano is dormant – it last erupted over 4,000 years ago. There are no indications of it erupting again in the near future. The volcano’s name, mostly unpronounceable for anyone other than locals, would be directly translated as ‘Three Peaks Crater.’ The name comes from Árni B. Stefánsson, who was the first to explore the vault and who has pleaded the case for making it accessible for years. The three craters (one of which you will be descending into) are prominent landmarks, standing against the sky on the highland edge, about 20 km (13 miles) southeast of the capital area, within the protected area of Bláfjöll Country Park.

Simply put, Iceland is one giant geological hotspot. The country is one of the most active volcanic regions in the world, with eruptions occurring every 3–4 years on average. But why is Iceland so active? It´s mostly due to its location on the Mid-Atlantic Ridge, where the Eurasian and North American plates are moving apart – and therefore literally opening the earth’s crust. In the center of this ridge sits Thrihnukagigur volcano.The most north-easterly of the three peaks is a small cinder cone, standing about 35 m/100 ft higher than its surroundings. At the top of this cone is a funnel-shaped opening, about 4×4 m/12×12 ft wide, the entrance of a massive 120 m/400 ft deep, bottle-shaped volcanic vault, measuring 50×70 m/160×220 ft at the bottom. Volcanic passages continue down to the southwest, to a total depth of about 200 m/700 ft.

The beauty of the crater mostly consists in the various colorations found inside it and it’s enormous – and to some extent intimidating – size. To put it in context, the ground space is equivalent to almost three full-sized basketball courts planted next to each other, and the height is such that it would easily fit full sized Statue of Liberty into the chamber. So make no mistake – it’s huge!

One of a kind magma chamber

The magma chamber is often referred to as the heart of a volcano. It’s there that the liquid rock awaits to find a way through to the surface, causing a volcanic eruption. In most cases, the crater is usually closed after the eruption of cold, hard lava.

Thríhnúkagígur volcano is a rare exception to this, because the magma in the chamber seems to have disappeared. It’s believed that the magma solidified in the walls or merely retreated to the depths of the earth. Haraldur Sigurdsson, volcanoes, explains it like this:

 “Thrihnukagigur is unique (…) It’s like somebody came and pulled the plug, and all the magma ran down out of it.”

When you arrive at our meeting point, which is a ski cabin, you will check in with our guide. The guide will meet and greet you at the cabin, before leading the way across the lava field.

When you get to the Base Camp, your group will be informed about all safety procedures. For example, how to behave in the crater. The guides will help you to put on a helmet and a harness. The group is split into smaller parties of 6–7 people. The trips up and down take about 6 minutes each way and the first ones to go down will be the first ones to go up.

You will spend about half an hour on the ground of the volcano, during which time you can take as many photos as you want. However, you are not allowed to take rocks and stones from the crater. Expert guides will be with you at all times, in the cable lift and on the ground in the magma chamber.

When you are back on the surface, while waiting for everyone in the group to complete the volcano visit, you will have the opportunity to enjoy a traditional Icelandic meat soup or vegetable soup and hot coffee/tea/chocolate.

Finally, you will walk back over the lava field. Again, you will be accompanied by a guide at all times. The bus will be waiting for you in the parking lot, ready to drive you back to Reykjavík.

We ask all visitors to behave responsibly during the tour. The environment is extremely sensitive, and we expect visitors to leave no footprint. What you carry in, you carry out

Tour Description

The dormant Thríhnúkagígur volcano is a unique natural phenomenon. By setting up the necessary gear and equipment, we’ve created a tour that opens the door to a new world. It isn’t that complicated to experience it. All you need is the willingness to do a moderate 45–50-minute hike (to get to the crater) and the guts to descend 120 meters/400 feet to the bottom of the crater in an open cable lift.

The Hike

The hike from the parking lot meeting point at Blue Mountains Country Park (Bláfjöll) to Thrihnukagigur volcano is an integral part of the tour, not only because of the breathtaking scenery but also because it’s one of only two options to get to the base of the volcano. The other option is to use a helicopter to get there. Helicopter tours are available, subject to availability.

The distance walked is approximately 3 km/2 miles each way, and it usually takes about 45-50 minutes for participants to complete the hike (depending on the group). After the descent into the volcano, guests walk back the same way.

The hike is classified as moderate in difficulty, roughly two on a scale of 5. Most of the way it is a straight walk with limited elevation. There is a hiking trail for the longest part of the walk, but the surface can be hilly and uneven. The last 10 minutes of the hike are the most challenging, with an elevation of around 100m/350ft.

You don’t need any particular skills or prior hiking experience to do the hike, but you need to be in decent shape. If you are suffering from any of the following, then the tour is probably not for you:

  • If you have problems with ankles, knees or any part of the feet.
  • Problems with the back and/or hips. There is a lot of pressure on the back when walking on such an uneven surface.
  • Obesity or being severely overweight.
  • Any other physical problem that might affect your ability to complete a combined walk of almost two hours within half a day.

One guide minimum is with you at all times, and there are a few (short) stops made on the way. We have a strict schedule to follow, and we expect tour guests to follow the walking speed set by the tour guide.

How it’s done

We have an innovative method to lower visitors down through the crater’s opening (roughly 4×4 m/12×12 ft width). We employ a system that’s normally used to carry window cleaners on the side of skyscrapers – an open elevator system.

A basket that holds 6–7 people is connected to a crane that has been placed vertically over the crater opening (see photo above, click on it for a larger version). Massive cable wires move the basket up and down the bottle-shaped vault.

The 120 m/400 ft journey takes about 6 minutes to complete, giving you an idea of how slowly you will be moving down into the crater. The slow speed is to ensure the safety of passengers, but also to provide the opportunity to enjoy the amazing scenery.

Everybody that goes down into the crater will be placed in a harness and required to use a helmet (provided on-site) at all times. Several guides, all highly trained and experienced mountain guides and cave explorers, will be with you at all times. One expert guide will be placed at the top of the crater, one will control and be in the basket with passengers, and one will be located on the ground of the magma chamber.

All equipment and processes have been tested extensively and approved by the administration of Occupational Safety and Health in Iceland.


Base camp is located at the base of the volcano. This is where guests are geared up and served some delicious Icelandic meat soup (after completing the hike). Refreshments (water, coffee, tea) are also included in the tour and are served at base camp.

The facilities at base camp are modern, made from three work sheds generally used for construction workers. And, just like everything else on location that’s too heavy for personal transport, the sheds were brought in by helicopter.

We’ve done our best to make the place warm and cozy, as it’s essential to be able to provide shelter for visitors when the weather is not in our favor. We offer most of the necessities required for a day in the wilderness, including toilet facilities and even a wireless internet connection.

Base camp is also the only place on earth where you can buy InsideTheVolcano products and souvenirs.

1) Arriving from Reykjavik with included transfer:

The scheduled tour includes pick-up and drop-off from/to your hotel in Reykjavik. We highly recommend this option!

If you have a rental car or if you do not want to use the included hotel pickup, you can go directly to the Gray Line central bus station in Reykjavik. The bus departs from there at the scheduled departure time. Please be there at least 20 minutes before the scheduled departure time.

2) Arriving on your own from Reykjavik:

The GPS coordinates for the meeting point at Blue Mountains parking lot are: N 63.98502 (Latitude),  W -21.649949 (Longitude). Please also read the directions below the map to be safe!

View Thrihnukagigur Volcano – Inside the Volcano  in a larger map

From your location in Reykjavik, find your way to Ring Road route nr. 1 (purple line), through Sudurlandsvegur road. Drive straight for about 15 minutes and then turn right on to Blafjallavegur road nr. 417 (dark green). Drive straight down this path until it changes into road nr. 407. Don’t make a right turn to the gravel part of road 417 – continue straight on the road 407 towards the ski resort.

The roads are paved all the way from Reykjavik to the meeting point and suitable for all vehicles (even small cars like Toyota Yaris or similar). If you are at any point driving on a gravel road, then you are on the wrong track.

After driving for around 10 minutes after turning off Route 1, you’ll see a sign that says ‘Inside The Volcano – Parking 300 meters’. Drive that distance, and you will notice a parking lot that also holds a sign marked ‘Inside the Volcano.’ Please note that there are other parking lots in the area, but the correct one is where you´ll see our sign (and probably other cars as well!)

The tours depart from Reykjavik at 08:00, 09:00, 10:00, 12:00, 13:00, 14:00 and 16:00, and the walk over the lava field starts around 30 minutes past the hour. So, you should be on the parking lot 20 minutes past the departure hour you have booked. Do not be late! Wait for a guide, who will escort you and other passengers on this tour during the hike from the parking lot to the volcano.

3) Arriving on your own from the Golden Circle area/South Coast:

From your location in the southwest corner of Iceland, find your way to the town of Selfoss and/or Hveragerdi. From either of those towns, follow Ring Road route nr. 1 westbound (Light green) through Sudurlandsvegur road. Drive straight for about 15 minutes from Hveragerdi village, until you can take a left turn onto Blafjallavegur road. Follow the directions as stated above.
View Thrihnukagigur Volcano – Inside the Volcano  in a larger map

2 reviews

  1. Truly stunning!

    We had an unforgettable time on this tour that I will cherish for the rest of my life. What an other worldly experience! The staff was amazing, the views terrific and the walk just as stunning. Strogly recommended! It is really worth it.

  2. Truly once in a lifetime experience

    It was just amazing! The surroundings are breathtaking. The volcanic cave is just like being on another planet. The staff was very experienced, professional and spot on with safety. Would 100% go again if I could

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