The Presque Isle River carves round potholes in Nonesuch Shale rock before flowing into Lake Superior. Porcupine Mountains Wilderness State Park, Michigan, USA.
The Presque Isle River carves round potholes in Nonesuch Shale rock before flowing into Lake Superior. Porcupine Mountains Wilderness State Park, Michigan, USA.
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- Tom Dempsey
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- USA: Michigan, USA: Midwest favorites: IL, IN, MI, MN, MO, NE, ND, OH, SD
