Isole Eolie
Itinerary B

[2]The water is nevertheless of volcanic origin

Though it does not contain gypsum, sulphur or other sublimates, the water that flows from the ancient thermal spring of Saint Calogerus is nevertheless volcanic in origin. It passes through volcanic soils which, by nature, are rich in these minerals.
When the wind drops, bring your nose close to the water to smell the typical sulphur odour of all volcanic areas.