pozzuoli, the super active volcano of the campi flegrei.

geology terrain cliff rock wadi soil badlands coast mountain valley plateau sea ridge formation trail wall ruins river landscape fumarole sulfuric mineral vapor hot bradyism active mystery heat clouds mountains crater fog hydrothermal solfatara pozzuoli thermal volcanic phenomena fumaroles solfatara super volcano valley eruption campi flegrei rock ecosystem caldera national park wildlife nature volcanic geyser hiking steam geothermal mountain tourism outdoor water sky italy naples sulfur beautiful bison orange barren palpitation