Norris Geyser Basin is the hottest and most changeable thermal area in Yellowstone. Rainbow Colors, hissing steam, and pungent odors combine to create an experience unique in Yellowstone. Porcelain Basin is open terrain with hundreds of densely packed geothermal features. The hottest of Yellowstone's geothermal features are steam vents (fumaroles). Their temperatures have been measured at 199 to 280 degrees F.
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