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Firehole River

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Like many other places in Yellowstone, the Firehole River is a scenic spot that lives up to its dramatic name. As it meanders north for 21 miles to join with the Madison River, the Firehole acts as a drainage basin for many of the park’s geothermal features. In collecting all of the mineral rich water, which has been naturally heated by the earth, the Firehole River can run 15 degrees warmer than surrounding rivers and lakes—with the steam that’s often emitted from the surface being one of the reasons for its name. Despite its boiling appearance, however, water temperatures are still fairly moderate at around 75°F (23.8°C), which makes it a comfortable temperature for splashing at the Firehole River swimming hole.

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