Formed during an eruption 9,000 years ago, Gjabakkahellir lava tube cave in Thingvellir has a unique feature in that it’s open on both ends so visitors are able to walk directly through it. Inside are incredible rock formations in various colors, and stalactites of all shapes and sizes.

Gjabakkahellir cave is a 360 meter long lava tube located in the Thingvellir National Park and was discovered in 1907 when workers were preparing a road between Thingvellir and Geysir for the King of Denmark, which at that time ruled Iceland as a colony.

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Can you go Spelunking in Gjabakkahellir cave?

Gjabakkahellir is easily accessible. There is only a 50 meter walk from the road to the opening of the cave. Once inside it has all the typical features of a lava tube. Most impressive are the lava falls and shark tooth stalactites.

The cave floor is covered with large rocks that have fallen from the cave ceiling in the cooling phase of lava field. Participants will in places have to use both hands and feet to navigate through the rough terrain.

Since then more than a dozen of caves have been discovered in the area. One of those appears just as a hole into the ground within a 20 meter distance from Gjabakkahellir.

We recommend that you explore the cave with an expert guide.

How long is Gjabakkahellir cave?

The cave is 360 meter long and was formed in an eruption thousands of years ago.

Where to find Gjabakkahellir cave?

Gjabakkahellir is in Thingvellir National Park, but it is situated in the heath between Thingvellir and lake Laugarvatn. On Google Maps it is called BlueBerry Cave.

Is a guide needed to explore Gjabakkahellir cave?

No, though we recommend having one. The footings can be treacherous at times. If you decide to explore the cave on your own, please wear good shoes, bring lights and wear a helmet.