Photographs of Biscuit and Black Sand Basins, Upper Geyser Basin, Yellowstone National Park

Wyoming > Yellowstone National Park > The Southwest > Upper Geyser Basin > Photographs

Curvy, sulfur-stained formations around Avoca Spring, in Biscuit Basin

Keywords: Yellowstone National Park, Biscuit and Black Sand Basins, Upper Geyser Basin, Wyoming, thermal features, geyser basins, boiling water, springs

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