Caldera volcano with pumice fields, yellow coloured sulphur stones, Alexandros crater, Nisyros, Dodecanese, Greece, Europe

aegean sea aegean alexandros crater balkan peninsula balkans balkan barrenness barren boiler caldeira calderas caldera colored coloured colourings colouring craggy crater landscape craters crater deserted desolate dodecanese dodekanisa dyed empty europe greece greek igneous rocks igneous rock igneous rock islands island jagged kettles kettle landscapes landscape meager meagre mediterranean area mediterranean region minerals mineral mountains mountain nisyros nobody no one no people notio egeo pumice fields pumice field pumice rocks rocky rock rugged rutted scenery south aegean southeastern europe southeast europe southern europe south europe sulfur sulphur stones sulphur stone sulphur sulphur travel photography travel uninhabited volcanic areas volcanic area volcanic landscapes volcanic landscape volcanic rocks volcanic rock volcanic volcanism volcanoes volcano landscape volcano mountain volcano volcan yellow