West Thumb may refer to the following features in Yellowstone National Park:

• The most western portion of Yellowstone Lake formed by a volcanic eruption 174,000 years ago
• West Thumb Geyser Basin, a thermal area on the shores of that portion of Yellowstone Lake
• West Thumb Junction, used to refer to the general area of the park, often used interchangeably with nearby Grant Village

This disambiguation page lists articles associated with the title West Thumb.
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