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1184-9242 - Fairmont Banff Springs Hotel viewed from Sulphur Mountain top, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America
746-91178 - Reykjanesviti lighthouse with steam hovering over the hot springs of the geothermal area Gunnuhver and teh geothermal power plant Sudurnes. europe, northern europe, iceland, February
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
![Clay loaded with iron oxides and dried out, Rio Tinto, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.](https://images.robertharding.com/zoom/RM/RH/HORIZONTAL/860-288801.jpg "Clay loaded with iron oxides and dried out, Rio Tinto, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.<br />860-288801")
860-288801 - Clay loaded with iron oxides and dried out, Rio Tinto, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.
![Reflections on Rio Tinto, near its source, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.](https://images.robertharding.com/zoom/RM/RH/HORIZONTAL/860-288798.jpg "Reflections on Rio Tinto, near its source, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.<br />860-288798")
860-288798 - Reflections on Rio Tinto, near its source, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.
![R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.](https://images.robertharding.com/zoom/RM/RH/HORIZONTAL/860-288800.jpg "R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.<br />860-288800")
860-288800 - R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.
![R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.](https://images.robertharding.com/zoom/RM/RH/VERTICAL/860-288799.jpg "R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.<br />860-288799")
860-288799 - R?o Tinto, Andalucia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.
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
832-384731 - Geothermal area with sulphur deposits and acidic salt lakes, Dallol, Danakil Valley, Ethiopia, Africa
832-387612 - Puente del Inca, old thermal bath of the sulphur spring, near Uspallata, Mendoza Province, Argentina, South America
832-384730 - Geothermal area with sulphur deposits and acidic salt lakes, Dallol, Danakil Valley, Ethiopia, Africa
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
1179-4412 - Sulphur acid hot springs, Dallol, Danakil Depression, Afar Region, Ethiopia, Africa
1179-4414 - Tourists looking at hot springs and sulphur ponds, Dallol, Danakil Depression, Afar Region, Ethiopia, Africa
746-89392 - Mammoth Hot Springs with bare tree trunk in Yellowstone National Park, Wyoming.
832-380927 - Krafla volcanic area, sulfur springs, Leirhnjúkur, Reykjahlíð, Mývatni, Island
832-380925 - Krafla volcanic area, sulfur springs, Leirhnjúkur, Reykjahlíð, Mývatni, Island
746-88316 - Geothermal area Hveraroend near lake Myvatn and the ring road during winter with mud pools , fumaroles and solfataras. europe, northern europe, scandinavia, iceland, February
746-88258 - Geothermal area Hveraroend with mudpots, fumarales and solfataras near lake Myvatn and the ring road. europe, northern europe, iceland, February
746-88315 - Geothermal area Hveraroend near lake Myvatn and the ring road during winter with mud pools , fumaroles and solfataras. europe, northern europe, scandinavia, iceland, February
746-88317 - Geothermal area Hveraroend near lake Myvatn and the ring road during winter with mud pools , fumaroles and solfataras. europe, northern europe, scandinavia, iceland, February
1184-1853 - Colourful springs of acid in Dallol, hottest place on earth, Danakil depression, Ethiopia, Africa
1184-1857 - Colourful springs of acid in Dallol, hottest place on earth, Danakil depression, Ethiopia, Africa
1109-2010 - Tourist at Sol de Manana Geothermal Basin area, Altiplano of Bolivia, South America
1113-98956 - Geothermal hot springs near Gunnuhver, wooden platform, Reykjanes, Iceland
1113-98951 - Steam from a hot spring at Krisuvik, Reykjanes, Iceland
1179-69 - Sol de Manana, a geothermal field in Sur Lipez Province in the Potosi Department, Bolivia, South America
832-375944 - Hot spring, Yellowstone national park, Wyoming, USA
832-294637 - Thermal spring in Saturnia with sulphur-containing water of the Monte Amiata Manciano Toskana Italien
832-283851 - Geothermal power plant which uses the hot water coming from drill holes 2 km deep near the volcano Krafla Iceland
832-283838 - Solfatara and boiling mud at the mountain Namafjall Iceland
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
1-17490 - Sulphur springs, Soufriere, St. Lucia, Windward Islands, West Indies, Caribbean, Central America
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