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The "Caldeira Velha" ("Old Boiler") is an idyllic setting with a hot (35ºC/95ºF) waterfall over an escarpment that is covered with lush plants and fern trees. The iron content of the water has stained the rocks a rusty red colour, which contrasts sharply with the intense green of the surrounding vegetation. You may enjoy an hot shower in a subtropical environment. You can also see the "fumarolas" (bubbling hot water), with its typical smell.