The Firehole River in Yellowstone National Park, Wyoming is perhaps one of the most unique trout streams in the world. Flowing through three of the largest and most active geyser basins, including the iconic Old Faithful and Grand Prismatic Spring areas, this 21-mile river offers an otherworldly fishing experience. The outflow from these geothermal features flows directly into the river, creating a fishing environment unlike any other, where anglers must dodge mud pots and hot springs as they walk along the banks. What makes the Firehole particularly special is the combination of its robust aquatic insect population, wild trout fishery, and the surreal experience of fishing amidst rising steam and geothermal features that give the river its name. While not known for trophy-sized fish, the Firehole more than compensates with its scenic beauty, abundant trout, and exceptional dry fly fishing opportunities that have earned it a place on many anglers' bucket lists.