Thermal Waters of los Baños de Mula Nature · Mula, Río Mula, Murcia Image of Mula, not of the place itself. Thermal spring known since Roman times, whose waters rise naturally at a constant temperature of between 36 and 37 ºC and were declared of medicinal use in 1882. A 17th-century earthquake shifted the spring from the left bank of the River Mula to the right, where the pedanía of Baños de Mula stands today. Photo: Ugo Cuesta (CC BY-SA 3.0) What to see and do in Mula