San Casciano dei Bagni is a tiny village near Siena with a little over 2,000 inhabitants, including those living on farms in the outskirts. At an altitude of 582 meters, it is situated between the Paglia and Chiana valleys and surrounded by the Cetona, Amiata and Radicofani mountains. Its territory borders the regions of Umbria and Lazio. The thermal waters at San Casciano gush out from a multitude of springs constituting a basin of noteworthy capacity. The chemical - physical characteristics classify it as hyper-thermal, sulfuric, calcic and magnesic water: at some of these springs natural, thermal mud is formed that has extraordinary therapeutic properties. The muds are obtained through a natural mixture of mineral water and clay that is steeped and enriched with mineral components in underground cavities that surround San Casciano dei Bagni.