Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
On the slopes of the Nevados de Chillán volcanic complex, in Chile's Bio-Bío region, Termas de Chillán sits in the Valle Hermoso sector. Indigenous peoples of the area knew of these springs long before Spanish settlers arrived; as early as 1703, Father Diego de Rosales wrote of pilgrims finding relief there. Of volcanic origin, the water carries sulfur, iron, calcium, magnesium.
Insider tip — Termas de Chillan sits at 1,800 m on the flanks of the active Nevados de Chillan volcanic complex, where fumaroles and sulfurous springs emerge beside a ski resort that operates in winter. The raw thermal pools upslope from the hotel complex allow direct contact with near-pristine volcanic water. A ski-and-soak combination is possible from July to September. In summer, hikers access the calderas and higher pools through Andean shrub meadows with Patagonian condors overhead.