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U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
The Ridges Sanctuary is named for its distinctive topography, a series of 30 ridges and swales formed by the movement of Lake Michigan over the past 1400 years, creating Wisconsin’s most biologically diverse ecosystem.
Public Domain. The Ridges Sanctuary\Doug Sherman
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