Eruption of Castle Geyser with thermophilic bacterica mats in foreground, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

day outdoors vertical landscape landscapes scenics nature natural world geology physical geography surface processes thermal areas steam steaming spouting spraying erupting eruption geysers castle geyser upper geyser basin yellowstone yellowstone national park national parks world heritage site wyoming usa united states of america north america natural landmarks