The hot spring that originates the Terme di Saturnia is born in the depths of a volcano no longer active, Mount Amiata. In its long underground run (about forty years), water is enriched with gases and mineral salts. Then pour into a natural crater (where the thermal spa rises) at a constant temperature of 37.5 °. The flow rate of the source (800 liters per second) preserves the beneficial properties of water and guarantees continuous replacement. Saturnia’s seabed has remarkable healing powers thanks to the presence of various elements, including the spa plankton. They are effective in treating skin problems, cardiovascular, respiratory and spinal diseases. They lower the pressure, purify the liver, help digestion and breathing. The waterfalls of the mill are one of the most fascinating places of the Maremma Tuscany, famous in the world for the extraordinary surrounding nature. The water that comes from Mount Amiata fills the natural crater where the spa is located. Then flow through a brook (the Gorello) for more than 400 mt, where a slope creates waterfalls. Over the centuries, the fallen water, dug the travertine rocks and created the striking natural pools.