yellowstone national park, upper geyser basin, doublet pool hot spring, wyoming, usa

algae america american and attraction basin beautiful blue colorful colourful deposits doublet environment features forest geology geothermal geyser geyserite hike hiking hill hot landscape make national natural nature north of one orange outdoor outdoors outstanding park path plateau pool scalloped snow spring springs states steam supervolcano surround tectonics that this tourist trail travel travertine united upper usa volcanic volcanism water west western white wild wilderness wyoming yellowstone