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Boiling River Trail is located in the Mammoth Hot Springs area near the north entrance of Yellowstone National Park. An underground discharge of water from a mysterious source beneath nearby hydrothermal terraces flows out of the ground at over 100 degrees.
The park website describes the site as the hottest thermal area in Yellowstone. It says that the superheated water of geysers can reach the boiling point while circulating deep in the Earth and as high as 400 degrees Fahrenheit, or 205 degrees Celsius, within the geyser plumbing system as it pushes upward.