Terme di Saturnia is a lush geothermal spring, with steamy water temperatures nearly 100 degrees Fahrenheit. The natural evolution of the landscape has smoothed out the spring and created waterfalls and shallow pools turning Terme di Saturnia into a giant, relaxing outdoor spa. While enjoying the posh lifestyle under the springs, take a moment and realize to understand this ancient luxury. The spring at Saturnia has flowed consistently for over 3000 years, and was even used by Roman nobles.