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Caves Surtshellir, Stefanshellir and Vidgelmir - in Hallmundarhraun

Three of Iceland's largest lava tube caves

We at Extreme Iceland offer both day trips and weekend trips to Iceland’s largest lava tubes named Surtshellir, Stefanshellir and Vidgelmir, all located in Hallmundarhraun lava field.


Duration: Flexible

Available: All year

Bring with you: Warm and waterproof clothes, sturdy hiking boots/shoes (also available to rent).

For further information: Contact Us

Upon request.

For groups only (not scheduled tour)

Contact us about availability...

Tour Description

The Lava Field called Hallmundarhraun

Hallmundarhraun lava field was formed in giant eruption close to the Langjokull glacier around the year 930. Therefore it is likely that the first settlers in the Borgarfjordur area, the Vikings watched the molten lava flow when these giant lava caves were formed. The Hallmundarhraun lava field covers over 242 sq. kilometres. It consists of several large tubes, and some of them are Iceland’s longest and deepest lava tubes.

Hraunfossar or the Lava Falls, come from underneath the Hallmundarhraun lava field and cascade down the lava rocks. We’ll take a look at this pearl of Icelandic nature amongst others.

Door in Víðgelmir

Door in Víðgelmir

Cave Surtshellir

Surtshellir is the largest and best known of all caves in Iceland. Much has been written about Surtshellir and it is told that in earlier centuries a band of outlaws resided in the lava tube.

From there they raided the countryside and stole livestock from neighbouring farms. They fortified the cave and made the authorities’ task in finding and apprehending them more difficult. Today, 1000 years later, the remains of their settlement in the lava tube can still easily be seen.

Remains of human settlement in Surtshellir cave

Remains of human settlement in Surtshellir cave

Surtshellir lava tube is almost 2 kilometres long or 1970 metres. It has 5 skylights, all rather large except for one. The main part of the lava tube is almost 9 metres in height, although in the bottom part of the tube the ceiling is much lower. It will take a whole day to explore every corner of the cave, but if you’re willing to just see the main parts of this famous lava tube, the tour will only take around 2-3 hours.

Stefanshellir lava tube lies not far from Surtshellir. The main entrance to the cave is about 300 metres from Surtshellir’s northernmost skylight. Only about 30 metres divide the lava tubes from being joined into a single lava tube, so it’s really easy to consider them a single lava tube.

Cave Stefanshellir

Stefanshellir lava tube is 1520 meters long and if we add that to the length of Surtshellir lava tube they combine to give 3500 meters of great lava tubes.

The lava tube itself has very little breakdown and fairly smooth floor, so it’s easy to walk around the tube. The main entrance of the tube is a pitfall and can not be seen from far away. The lava tube forks in every imaginable direction and it’s really easy for those who don’t know the tube that well to get lost in the myriad of passageways.

Stefánshellir cave Iceland

Stefánshellir cave Iceland

The flat, dark, glacial sands seem to go on forever. Yet suddenly, the majestic Mælifell appears to rise up out of ground before us. Standing almost 200 meters (660 feet) above the surrounding plains, the view from the top will live with you forever. The mountain was formed during a series of eruptions under the huge glacier that covered this region during the last Ice Age. The short, steep climb is of course optional and weather dependent. Yet, just to be in this amazing location is truly a special privilege never to be forgotten.

Stefánshellir cave icy floor

Stefánshellir cave - icy floor

We usually return by the same, awesome route. The choice of where and when to stop (throughout the day) is determined by your guide. They use their experience to get the most out of your time. Dinner will be taken at a restaurant of your guide’s choice on the way to Reykjavik. Clients are dropped off at their hotels in the evening after an unforgettable experience.

Cave Vidgelmir

Vidgelmir lava tube is the farthest away of the three lava tubes in Hallmundarhraun lava field. It takes about a half an hour to drive from Surtshellir lava tube to Vidgelmir lava tube. Vidgelmir is around 33 kilometres from the main crater and about 5 kilometres from Surtshellir lava tube. Vidgelmir lava tube is 1585 metres long, the highest point inside the tube is 15,8 metres and at its widest it is 16,5 metres in width.

The tubes volume is well over 150,000 cubic metres. It is clear, with those measurements in mind, that Vidgelmir lava tube is the largest of all lava tubes in Iceland. The pitfall which also doubles as an entrance is huge, 75 metres long and 15 metres wide and it is also very deep.

Víðgelmir cave is both deep and wide

Víðgelmir cave is both deep and wide

The cave starts with a narrow tunnel which leads into the main chamber and from there all the way into the bottom of the tube. This cave is huge and there is so much to see. It’s easy to see why Vidgelmir lava tube is considered one of Iceland’s most precious gems.

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Víðgelmir lava tube cave

Víðgelmir lava tube cave

Feel free to contact Extreme Iceland and discuss what we have to offer regarding tours to Hallmundarhraun lava field and its system of lava tubes.