Bagni San Filippo

Bagni San Filippo, Tuscany, Italy

Location: Bagni San Filippo, Tuscany, Italy
Water type: bicarbonate, calcium-rich
Temperature: 38 °C
pH: 8

Water profile

Thermicity

Neutral

38 °C

LowHigh

Soothing — neither hot nor cold, perfect balance.

Mineralisation

Restorative

LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy

Standard buoyancy

LowHigh

Soft water — natural, classic buoyancy.

BicarbonatesSodiumCalcium

Bagni San Filippo is a natural thermal spring complex in the Val d'Orcia near Castiglione d'Orcia in Siena Province, Tuscany, Italy, where calcium-bicarbonate waters at approximately 52 degrees Celsius flow freely over travertine limestone formations, depositing the white mineral calcite deposits known as the Balena Bianca (White Whale) and other fantastical natural sculptures that make this one of Tuscany's most visually extraordinary free open-air bathing sites. The spring is set within the Monte Amiata volcanic landscape of southern Tuscany, where the geothermal activity that drives the famous Saturnia thermal springs and the broader Maremma thermal tradition also produces the calcium-rich waters of San Filippo, flowing through ancient beech forest into natural pools of accessible mineral bathing. Visitors can bathe in the travertine-terraced pools at no cost, making Bagni San Filippo a rare combination of spectacular volcanic geology, Renaissance landscape beauty, and democratic thermal access in the heart of one of Italy's most celebrated UNESCO landscape regions.

Insider tip — Bagni San Filippo offers one of Tuscany's most visually arresting free thermal experiences, where 52°C springs cascade over a hillside of brilliant white travertine formations, creating natural pools accessible at no cost. The calcium-bicarbonate water builds up dramatic white mineral terraces reminiscent of Pamukkale but in a forested Apennine setting on Monte Amiata's flanks. The largest formation, the Balena Bianca or White Whale, is a popular photography subject particularly at dawn when mist rises from the warm water. Arrive before 9 am on summer weekends to claim the best pools before crowds from Siena and Rome arrive.

Find hotels nearby →See the map & practical info →