yellowstone wyoming usa may 2021 black pool west thumb geyser basin with tourists |
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| navigate by keyword : bacteria basin blue boardwalk boiling caldera danger deep emerald geothermal geyser green heat hot landmark landscape mineral national nature orange outdoor outdoors park people pool sapphire sky spring steam thermal tourism tourists travel tree volcanic volcano water wyoming yellowstone |
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| Black Pool in West Thumb Geyser Basin, Yellowstone, Wyoming, horizontal |
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