Natural Rock Arch

Arch Rock is a geological formation on Mackinac Island in Michigan. It is a natural limestone arch formed during the Nipissing post-glacial period, a period of high Lake Huron levels following the end of the Wisconsin glaciation. To this day Arch Rock stands on the Lake Huron shoreline 146 feet above the water.
  • Location: Mackinac Island, Michigan
  • Part of: Mackinac Island (ID66000397)
  • Designated NHLDCP: October 15, 1966
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Data from: en.wikipedia.org