• West Thumb Geyser Basin - Yellowstone National Park, Wyoming

      Photo by Peter Thody
      West Thumb bay is a volcanic caldera that last erupted some 180,000 years ago, and the magma that heats these thermal features is less than 2 miles under the surface. The micro-organisms that thrive in these hot springs give them their vivid blue and green colorations. As well as the brilliantly colored spings for which West Thumb is best known (the color comes from the micro-organisms that thrive in the hot waters), there are geysers and mud pots too.

      If you go:
      Follow the easy boardwalk trails through West Thumb Geyser basin and you begin to get an idea of just how close you are to the irresistable natural forces that bubble away under Yellowstone National Park.


      Grand Loop Road
      Yellowstone National Park, Wyoming 82190

      Mailing address:
      P.O. Box 168
      Yellowstone National Park, WY 82190-0168

      Phone Numbers:

      Recorded Visitor Information
      +1 (307) 344-7381

      Information for the Hearing Impaired (TDD)
      +1 (307) 344-2386

      +1 (307) 344-2014