Mammoth Hot Springs is a large complex of hot springs on a hill of travertine in Yellowstone. It was created over thousands of years as hot water from the spring cooled and deposited calcium carbonate. Although these springs lie outside the caldera boundary, their energy has been attributed to the same magmatic system that fuels other Yellowstone geothermal areas. There are some great spots to explore. You can access the lower boardwalk from the parking lot or the Grand Loop Road. You can access the upper boardwalk from the one-way Upper Terrace Drive and parking lot. The road winds among springs for 1.5 miles before it loops back for a half mile. The Upper Terraces include Prospect Terrace, New Highland Terrace, Orange Spring Mound, Bath Lake, White Elephant Back Terrace and Angel Terrace.
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