Soothing — neither hot nor cold, perfect balance.
Rich in active gases or metals — a strong mineral character.
Soft water — natural, classic buoyancy.
Furnas do Enxofre, on Terceira in the Azores, is a volcanic site where acidic sulfurous water (pH 3.6) reaches 35°C. Thermal pools, a spa, and thermal treatments sit amid the island's characteristic fumaroles.