The Furnas boilers are an area of various volcanic manifestations, including fumes and springs of boiling water. The mud and mineral water from the boilers are widely used in treating diseases such as rheumatism and bronchitis, due to its therapeutic properties. Here, The the volcanic soil is so hot that the locals bury big pots on the ground to cook the famous Furnas Stew (known as Cozido). The meat and vegetables that compose it take about five hours to cook underneath the ground. 

Two streams cross the valley, one with cold water and other of hot water coloured by the iron in suspension giving it an orange tonality.

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