Old Faithful

Old Faithful

Upper Geyser Basin

Upper Geyser BasinUpper Geyser Basin

Biscuit Basin

Biscuit Basin

Mammoth Terraces

Mammoth Hot Spring Terraces WebcamMammoth Terraces

If you walk down the asphalt path (the old road) to Castle Geyser and turn right, these are the thermal features you’ll encounter along the boardwalks. Tour links will be added in the future. Thanks for your patience while we fill in all the blanks.

*Indicates an unofficial name

More thermal features on this list may need a * to denote an unofficial name – a trip to visit the Nomenclature book is needed unless someone with a copy is willing to help sooner.

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