A muddy pool at the West Thumb Geyser Basin.West Thumb Geyser Basin.West Thumb Geyser Basin.The Surging Spring in West Thumb Geyser Basin.The Collapsing Pool in West Thumb Geyser Basin.West Thumb Geyser Basin.West Thumb Geyser Basin.View of the Yellowstone Lake from the West Thumb Geyser Basin.West Thumb Geyser Basin.West Thumb Geyser Basin.West Thumb Geyser Basin.West Thumb Geyser Basin.West Thumb Geyser Basin.West Thumb Geyser Basin.West Thumb Geyser Basin.
