Top: Pikrolimni flooded-May2016

Bottom: Pikrolimni, dry- September 2013 revealing mud and efflorescences of natron

Right(top) : natron crystals 

Right (bottom) : therapeutic mud on sale at the Pikrolimni Spa, Kilkis, N Greece.

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Images courtesy of Despoina Ignatiadou and Effie Photos-Jones