volcano boilers in las furnas, sao miguel, azores

active activity also are attraction azorean azores boilers boiling caldeiras caldera cauldron crater danger das different dry eruption europe flow forest fumarole fumaroles furnas geology geothermal geyser heat hot island landscape large lava miguel mud national nature others outdoor park portugal portuguese sao sapound seen smoke some spring springs states steam stone sulfur sulphur temperature thermal tourism tourist travel vapor volcanic volcano vulcan vulcapound apound water