83-13435 - Sulphurous fumaroles & volcanic strata in Tompaluan active crater on the flank of Mount Lokon, a volcano near Tomohon city. Gunung Lokon, Tomohon, North Sulawesi, Indonesia

1113-106415 - Ethiopia; Afar region; Danakil Desert; Danakil Depression; Dallol geothermal area; hot sulfur springs; cone-like formation in intense yellow, red and green tones

832-388929 - Geothermal area with sulphur deposits and acidic brines, Dallol, Danakil depression, Ethiopia, Africa

832-388928 - Geothermal area with sulphur deposits and acidic brines, Dallol, Danakil depression, Ethiopia, Africa

832-388958 - Aerial view, volcanic crater with colourful sulphur deposits, near Frioland ao Fjallabaki, Iceland, Europe

832-387612 - Puente del Inca, old thermal bath of the sulphur spring, near Uspallata, Mendoza Province, Argentina, South America

832-387613 - Puente del Inca, rock arch and old thermal bath of the sulphur spring above the Rio de las Cuevas, near Uspallata, Mendoza Province, Argentina, South America

832-383493 - Crater lake of Kawah Ijen, Kawah Ijen, Jawa Timur, Java, Indonesia, Asia

832-381377 - Boardwalk through the solfatara field Bumpass Hell, Lassen Volcanic National Park, California, USA, North America

832-380927 - Krafla volcanic area, sulfur springs, Leirhnjúkur, Reykjahlíð, Mývatni, Island

832-380884 - Emerald Lakes, crater lakes, volcanic landscape, Tongariro Alpine Crossing, Tongariro National Park, North Island, New Zealand, Oceania

832-380925 - Krafla volcanic area, sulfur springs, Leirhnjúkur, Reykjahlíð, Mývatni, Island

832-380804 - Two tourists standing beside steaming fumarole, solfatara in Hverarond, also Hverir or Namaskard, geothermal area, North Iceland, Iceland, Europe

832-379224 - 360 panorama with the green sulphurous Emerald Lakes and volcanio Mt Tongariro, Tongariro National Park, Manawatu-Wanganui, North Island, New Zealand, Oceania

832-379223 - 360 panorama with the green sulphurous Emerald Lakes and volcanio Mt Tongariro, Tongariro National Park, Manawatu-Wanganui, North Island, New Zealand, Oceania

832-337696 - Bumpass hell sulphur area at Lassen Volcanic National Park, northern California, USA

832-294637 - Thermal spring in Saturnia with sulphur-containing water of the Monte Amiata Manciano Toskana Italien

832-150770 - Hot volcanic springs, thermal bath, Saturnia, Tuscany, Italy, Europe

832-132122 - The basin of hot sulphur spring in Bagno Vignoni and Hotel Le Terme at night, Orcia Valley, Tuscany, Italy, Europe

832-124032 - Sulfur vapor, petrified trees in New Blue Spring Road, limestone sinter terraces, steaming geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America

832-95463 - Sulphure formations, Dallol, Danakil Depression, Ethiopia, Africa

832-85619 - Sulphure formations, Dallol, Danakil Depression, Ethiopia, Africa

832-85620 - Sulphure formations, Dallol, Danakil Depression, Ethiopia, Africa

832-85630 - Sulphure formations, Dallol, Danakil Depression, Ethiopia, Africa

832-47238 - Sulfur spring, Salar de Uyuni salt lake, Uyuni, Bolivia, South America

832-47239 - Sulfur spring, Salar de Uyuni salt lake, Uyuni, Bolivia, South America

832-22463 - Sulphuric vapours from a crack in the earth, Vulcano, Aeolian Islands, Italy, Europe

586-1463 - Pohutu geyser erupting steaming water from sulphurous mud and rock in Te Puia, Whakarewarewa Thermal Reserve in geothermal valley, Rotorua, North Island, New Zealand, Pacific

586-1294 - The Blue Crater Lake of Viti, which appeared after an eruption in 1875, part of the sulphurous geothermal area of Namafjall, Reykjahlio, Iceland

83-5013 - Steam issuing from sulphurous fumarole at Gran Craters, Vulcano Island, with islands of Lipari and Salina beyond, Aeolian Islands (Eolian Islands) (Lipari Islands), UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe