The Firehole River has a lot of great features along it. One of my favorite places in Yellowstone is the hike along the Firestone River that starts next to Old Faithful. There are a bunch of geysers and colorful hot springs along the river. My top four geothermal sites in Yellowstone are the Grand Prismatic Spring, the Firehole River trail starting at Old Faithful, Mammoth Hot Springs, and Fountain Paint Pot. If you are only going to stop at some of the geothermal sites then these are the must stop places.
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