Emerald Pool, geyser, drainage area with a boardwalk, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

america american area areas attraction attractions bacteria bacteria bacterium basin being beings black boardwalk boardwalks bodies body coloured conservation countryside day daylight daytime dock docks drainage during emerald energy exterior exteriors famous footbridge footbridges geologic geological geologically geology geothermal geothermic germs geyser geyser geysers hot hot spring hot springs human humans known landscape landscapes microorganisms national national natural nature north of outdoor park park parks people person persons photo photos pier piers pool power preserve preserves renowned reserve reserves sanctuaries sanctuary sand scenery scenic seeing shot shots sight sights site sites source sources spring springs states the thermal thermophilic tourism tourist touristic touristical touristically tourists touristy united upper us us american usa water waters well well known wells wildlife with wood wooden worth wyoming yellowstone