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The road to Krýsuvík passes by a solfatara field at Seltún. The main sulphur area is a fumarole field in the col to the southwest. At Seltún, there are mud pools and steaming ground where some sulphur and also white and yellowish brown sulphates are deposited. The sulphates dissolve in water and become mottled and disappear in rainy wheather. The largest mud pools are east of the road, one of them almost extinct and filled with mud washed in by the stream from the solfatara creek west of the road. (source:

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