It`s estimated there are around 4,000 fumaroles in Yellowstone National Park. Most of the ones I saw were in concentrations of geothermal pools. Once though, I was walking along a creek and came upon a singular vent shooting steam into the air just a few feet away from the cold flowing water. From an elevated view one can see them steaming all across the landscape. In places, the heat can be felt through the soles of your shoes. It is eerie and humbling to feel the inert earth itself quite alive and in motion.
watermedia on Yupo 6.5x7.5