The 'Balena Bianca' (White Whale) formation is one of the largest active calcifying deposits in Italy.
The water is rich in sulfur, calcium, and magnesium, traditionally believed to have therapeutic properties for the skin and joints.
The pools are located within a dense woodland area, providing a natural filter for sunlight throughout the day.
The geological formation process is ongoing, meaning the physical structure of the pools changes slightly every year due to mineral deposits.
The area is situated at the foot of Mount Amiata, an extinct volcanic complex that influences the geothermal activity of the region.
The San Filippo Thermal Pool Baths, also known as Bagni San Filippo, are characterized by the Balena Bianca, a massive white limestone formation created by calcifying thermal waters. The Fosso Bianco stream flows through the forest, creating a series of natural tiered pools where hot, mineral-rich water accumulates. The water temperature reaches approximately 48°C at the source, cooling as it travels downstream. The high calcium carbonate content in the water constantly deposits sediment, continuously reshaping the landscape of the pools. The site is located in the Val d'Orcia, a UNESCO World Heritage site known for its unique geological and clay-based terrain.
The base of the Balena Bianca, looking upward to capture the contrast between the white mineral formation and the surrounding green forest.
Wear sturdy water shoes with grip to navigate the slippery, calcified limestone surfaces of the pools.
Bring a dark-colored swimsuit, as the mineral-heavy water and sulfur can leave lasting stains on light-colored fabrics.
Visit during the shoulder seasons to avoid the heat and humidity of the deep forest in mid-summer.
Do not attempt to climb or stand on the main 'Balena Bianca' waterfall structure, as it is unstable and protected to prevent erosion.
The area is open year-round, though the forest trails can become muddy and slippery during the winter months.
Respect the fragile limestone formations by avoiding climbing on the delicate, thinner parts of the white cliffs. Pack out all trash to preserve the natural ecosystem.
