About
The largest hot spring in the United States, ringed in bands of orange, green and deep blue.
A 370-foot-wide thermal pool whose colours come from heat-loving bacteria around the rim. The boardwalk gives a close view, but the best view is from the Fairy Falls overlook trail a short drive south.
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Visitor Tips
Do the Fairy Falls overlook trail for the postcard view
Stay on the boardwalk - the crust is thin and dangerous
Steam is thickest in cold mornings, which hides the colours
