The thermal resort Mercure Petriolo Siena Terme Spa is located above the Bagni di Petriolo, in the municipality of Civitella Paganico, immersed in the Basso Merse Nature Reserve.
The first records of the Petriolo Baths date back to 1230 although they were already known since Roman times. During the Renaissance period, the first spa complex was built, whose entire fortified stone structure is still visible today.
The thermal water of Petriolo flows from the spring located on the bank of the Farma stream at the temperature of +43°C and is rich in hydrogen sulfide. Among the various therapeutic indications are skin diseases (acne, psoriasis, eczema), the musculoskeletal system (chronic arthopathies and osteoarticular diseases) and those related to the respiratory tract (pharyngitis, sinusitis, rhinitis).
The spa offers a path designed to stimulate and renew the entire organism through a wide range of treatments and services. It offers two thermal pools, two heated whirlpools, sauna, Turkish bath, Kneipp path and sensory shower.