Sleeping Bear Dunes National Lakeshore encompasses a 60 km (35 mi.) stretch of Lake Michigan's eastern coastline, as well as North and South Manitou Islands. The park was established primarily for its outstanding natural features, including forests, beaches, dune formations, and ancient glacial phenomena. The Lakeshore also contains many cultural features including a 1871 lighthouse, three former Life-Saving Service/Coast Guard Stations and an extensive rural historic farm district. Authorized: October 21, 1970. Acreage: 56,993 federal, 14,194 non-federal.