Boiling mud pools at Hverarönd (Hverir) near Námafjall mount, Mývatn, IcelandHot spring at Chae Son (Jae Sawn) National Park, Lampang, ThailandGrand Prismatic Spring in Yellowstone National Park, Midway Geyser Basin, Wyoming, USA
Dallol volcano in Danakil Depression, Afar Region, Ethiopia
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