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Gjabakkahellir (a.k.a. Helguhellir or Stelpuhellir ('Girl cave')) is a  lava tube, located in the area of Thingvellir National Park.

Gjabakkahellir formed around 9000 years ago. With its many beautiful lava formations and ice sculptures, it is considered a prime example of an Icelandic lava tube, offering breathtaking sights.