This geothermal area consisting of hot springs, fumaroles, and mud pots is a natural marvel. The temperature can reach up to 198 °F.
Wikipedia http://en.wikipedia.org/wiki/Geothermal_areas_in_Lassen_Volcanic_National_Park#Bumpass_Hell
Address 96071, United States
Coordinates 40°27'29.039" N -121°30'6.67" E