thermal spring water cascading in the pool of the natural monument of caldeira velha, são miguel - azores portugal

attraction azores açores bath biosphere caldeira cascading climate cyatheaceae destination environment europe famous fern ferns flora foliage forest geologic geology geothermal grande hot iconic island landscape laurisilva leisure miguel monument natural nature outdoor park pool portugal portuguese rainforest reserve ribeira sao scenic season spring thermal tourism touristic travel tree tropical velha volcanic water waterfall wild