steaming hot sulfur springs of seltun geothermal area, krysuvik, reykjanes peninsula in iceland

seltun geothermal area sulfur springs water thermal pool krysavik reykjanes mineral heat pond spring geologic basin geothermic boiling europe krysuvik brown environment tourist attractions steaming geo activity smoke hot hydrothermal evaporation icelandic volcanism rock ground mud volcano outdoor travel geology steam natural nature iceland volcanic peninsula