A free warm stream with white calcium deposits near the village of Bagni San Filippo, popular with locals in cooler months.
Bagni San Filippo lies at the foot of Monte Amiata. A short path descends to the Fosso Bianco stream, where warm sulphur water has deposited white calcite formations. Facilities are minimal and the site is best outside summer weekends. Visitors should confirm current access and local rules.
| Distance | About 75 km south of Siena |
|---|---|
| Getting there | Car recommended (about 1 hour 15 minutes from Siena via SS2 Cassia and Castiglione d'Orcia). |
| Difficulty | moderate |
| Best season | October-April |
| Address | Bagni San Filippo, 53023 Castiglione d'Orcia SI, Italy |
Amenities
- Free thermal stream with white calcite formations (Fosso Bianco)
- Small village with a few restaurants
- Paid thermal pool at a nearby hotel
Good to know
- Best for
- thermal bathing, hikers, budget travellers
- Water
- Warm sulphur water; temperature varies along the stream. Conditions and legal status should be checked locally.
- Facilities
- Limited; bring towel and water shoes.
Location
Bagni San Filippo, 53023 Castiglione d'Orcia SI, Italy
42.9381, 11.7653 View on map
Highlights
- Free warm stream
- White calcite formations
- Monte Amiata setting
- Quiet in cooler months
Tips for visiting
- Wear water shoes; calcite is slippery.
- Check local notices before bathing.
- Avoid peak summer weekends.
- Combine with a hike on Monte Amiata.
When to visit
Autumn and winter weekdays
Accessibility
Steep unmarked path to the stream; not suitable for wheelchairs.
Frequently asked questions
Is it free?
The Fosso Bianco stream is described as free to visit; confirm locally.
Is there parking?
Roadside parking near the village is limited.