Sleeping Bear Dunes National Lakeshore is a U.S. national lakeshore in the northwestern Lower Peninsula of Michigan. Located within Benzie and Leelanau counties, the park extends along a 35-mile stretch of Lake Michigan's eastern coastline, as well as North and South Manitou islands, preserving a total of 71,199 acres. The park is known for its outstanding natural features, including dune formations, forests, beaches, and ancient glacial phenomena.