caldeiras das furnas, sao miguel island, azores, portugal

unesco world heritage archipelago atlantic attraction azores aasect ores boiling caldeira asmodeu caldeiras das furnas caldera cozido crater eruption europe famous place fumarolas gas geology geothermal geysers hot ilha sapound miguel island lake mountains nature park portugal portuguese povoacao sao smoke spa springs steam sulfur terra nostra thermal tourist trachytic volcanoes travel destination vacation valley village volcanic volcano warm water