old crater in manziana - carbon dioxide coming out of the earth through water and forming small geyser

activity beautiful boiling bubbles caldara colorful country countryside crater creek europe european fields fumarole gas geological geothermal geyser italian italy lake landscape lazio liquid manziana mediterranean mineral mud multicolor natural nature outdoors pond pool reserve river rocks scenic smell solfatara steaming stream sulfur sulfuric sulphur thermal trunks volcano water white