Víti crater was formed in the eruption of 1875. Víti is a smaller explosion crater on the north east shore of Öskjuvatn, approximately 150 metres diameter. It contains a geothermal lake of mineral-rich, sulphurous, opaque blue & emerald green water, which is maintained at a comfortable temperature for swimming. Swimming in these craters is not a good idea because Carbon dioxide can accumulate on top of the water, making you pass out and drown!

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