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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.
It then flows northward into Yellowstone Lake, and, after exiting the north end of the lake, plunges 422 feet (129 metres) in two spectacular waterfalls and enters the magnificent Grand Canyon of the Yellowstone. The river then winds north and northwest before leaving the park at Gardiner, Montana.