The springs that feed the baths, which are found in the south-eastern valley, cover a vast territory that stretches from Mount Amiata and the hills of Fiora and Albegna rivers to the Maremma grossetana at Roselle (Terme di Roselle) and Talamone (Terme dell'Osa).
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 hot springs travertine formations.
[1] The area around the hot springs provide habitat for fox, wild boars, wolves and hedgehogs.
[citation needed] The yield of the source is about 800 liters per second, which guarantees an optimal replacement of water.