description Þorsteinshellir Overview
Þorsteinshellir is a lava tube in Iceland's Búrfellshraun lava field. It is part of a basaltic volcanic landscape and is recognized for its underground lava formations and for its use as a shelter in the past. The cave formed in a lava flow whose outer surface cooled while molten material continued to move beneath it, leaving a passage within the solidified rock.
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