The Terme di Saturnia are a group of springs located in the municipality of Manciano, a few kilometers from the village of Saturnia.
One legend, according to the Etruscans and Romans, was that the Terme di Saturnia were formed by lightning bolts, thrown by Jupiter. During a violent quarrel between the two mythological deities, the bolts thrown towards Saturn had missed, causing the formations.
The sulphurous spring water, at a temperature of 37.5 °C, are well-known for their therapeutic properties, offering relaxation and well being through immersion. The main thermal waterfalls are the Mill Falls, located at an old mill as well as the Waterfalls of Gorello.
The yield of the source is about 800 liters per second, which guarantees an optimal replacement of water. The chemical make-up is sulfur, carbon, sulfate, bicarbonate-alkaline, earth, with the presence of hydrogen sulfide gas and carbon dioxide. The minerals dissolved in water amount to 2.79 grams per liter.