Yellowstone National Park Fumaroles
Fumaroles, or steam vents, are hot springs with a lot of heat, but so little water that it all boils away before reaching the surface. At places like Roaring Mountain, the result is a loud hissing vent of steam and gases.
You love your mummy bag, you really do. It's soft and warm and packs down to the size of a hydro flask, but damn do you...
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