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 bacteria bacteria bacterium basin black boardwalk bodies body coloured conservation countryside day daylight daytime drain drainage draining during emerald energy exterior exteriors famous geologic geological geologically geology geothermal geothermic germs geyser geyser geysers hot hot spring hot springs known landscape landscapes microorganisms national national natural nature nobody north of outdoor park park parks photo photos pool power preserve preserves renowned reserve reserves sanctuaries sanctuary sand scenery scenic seeing shot shots sight sights source sources spring springs states the thermal thermophilic united upper us us american usa water waters well well known wells wildlife with worth wyoming yellowstone