Grjótagjá
Encyclopedia
Grjótagjá is a small lava cave
near lake Mývatn with 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 °C. Though the temperature is slowly decreasing and has fallen below 50 °C again, bathing is still not possible there. The nearby lava cave of Stóragjá is being used as an alternative bathing site.
Lava cave
A lava cave is any cave formed in volcanic rock, although in typical usage it is reserved for caves formed by volcanic processes, which are more properly termed volcanic caves...
near lake Mývatn with 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 °C. Though the temperature is slowly decreasing and has fallen below 50 °C again, bathing is still not possible there. The nearby lava cave of Stóragjá is being used as an alternative bathing site.