Grjótagjá

Cave and hotspring

Grjótagjá is a small lava cave near lake M00fdvatn in Iceland. It has a thermal spring inside.

In early 18th century the outlaw Jón Markússon lived there and used the cave for bathing. Until the 1970s Grjótagjá was a popular bathing site. But during the eruptions from 1975 to 1984 the temperature of the water rose to more than 50 00b0C (122 00b0F), though the temperature is slowly decreasing and has fallen below 50 00b0C again. The nearby lava cave of Stóragjá is being used as an alternative bathing site.

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