In the heart of the Ombrone Valley, between Monticiano and Civitella Paganico, Bagni di Petriolo is one of the most famous hot springs in Tuscany.
Known since Roman times, the baths were frequented by important personalities such as Cicero, Pope Pius II and the Medici and Gonzaga families.
The thermal waters flow out of the spring at a temperature of 43°C and, for this reason, can be frequented in any season of the year, even in the coldest months.
The thermal baths are located among lush and wild forests, between the Riserva Naturale Torrente Farma (Farma Stream Nature Reserve) and the Riserva Naturale del basso Merse (Lower Merse Nature Reserve).
The remains of the medieval baths and the ancient city wall built by the people of Siena in 1404 are impressive, making Bagni di Petriolo an exceptional example of fortified thermal baths.
Two spas are located nearby: Terme di Petriolo and Mercure.
The peculiarity of this place is that the sulfurous waters come directly from underground and feed small natural pools that are located on the banks of the Farma and also in the river bed: the thermal water mixes with that of the river and reaches lower and lower temperatures, so everyone can find the ideal temperature!