Sinkhole Plain, polygonal doline karst, near Mammoth Cave, Kentucky, United States of America, North America
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aerialaerialsamericaamericanamericasdaydaytimegeologyhigh angle viewkarstkentuckykylandscapelandscapesnatural worldnaturenobodynorth americaoutdoorsoutsidephysical geographypolygonal dolinepolygonal doline karstscenicssinkhole plaintopographytraveltravel destinationsususaunited statesunited states of america