the south scalloped spring on the bank of the firehole river in the upper geyser basin in yellowstone national park

attraction bacteria bank basin boiling caldera continental deposits destination divide ecology environment firehole fumes geologic geology geothermal geyser heat hot landmark landscape mat mineral national natural nature outdoors outside park pool river scalloped scallopped scenic sky south spring states steam steaming thermal tourist touristic trail travel united upper usa vacation vapor volcanic volcano water wild wilderness wonder wyoming yellowstone