Mackinac Island, Michigan, USA - Sugar loaf, the largest post-glacial rock formation int he straits of Mackinac formed from eroded limestone.

- Image ID: 2A1DWX8

Mackinac Island, Michigan, USA - Sugar loaf, the largest post-glacial rock formation int he straits of Mackinac formed from eroded limestone.

Michael Padilla / Alamy Stock Photo

Image ID: 2A1DWX8

Location: Mackinac Island, Michigan, USA