Steinahellir is a cave 36 km from Hvolsvöllur under Eyjafjall just off the National Road #1 by the Bay of Holtsós. It is thought to be a natural cave that was later enlarged by man to make it more habitable. An outstanding feature of the cave is the grass that grows on the ceiling. The cave was used as an assembly place for local parliamentarians from 1820 to 1902. Old photographs show a wooden wall was once built inside the cave.
In 1858, the farmers under Eyjafjöll rebelled against the Sheriff of Ránga, who had made a rule that all sheep would need to be washed to combat the highly contagious psoroptes-ovis, (a type of mange that infects cattle and sheep.) The farmers disagreed and taking whips, nearly managed to drive the sheriff into the Hellisvatn pool, where they wanted to drown him. His deputy sheriff was so fearful that he revoked the ruling and thereby saved the sheriff from this punishment. The sheriff and his deputy rode away, humiliated, and the farmers mounted their horses gleefully, riding home to tell everyone of their victory. There are also many stories of elves and hidden people both in and around this cave. Steinahellir is protected.