Formed during an eruption 9,000 years ago, Gjabakkahellir lava tube cave in Thingvellir has a unique feature. 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 (1.181 ft) long lava tube located in the Thingvellir National Park. It was discovered in 1907 when workers were preparing a road between Thingvellir and Geysir for the King of Denmark, who at that time ruled Iceland as a colony. 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 (66 ft) distance from Gjabakkahellir.

Can you go spelunking in Gjabakkahellir cave?

Gjabakkahellir is easily accessible. There is only a 50 meter (164 ft.) walk from the road to the opening of the cave. Once inside you can see 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. Keep in mind that in some places you will need to use both hands and feet to navigate through the rough terrain.

Where to find Gjabakkahellir cave?

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

Is a guide needed to explore Gjabakkahellir cave?

No, though we strongly recommend having one. The footing 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.