Sanilac Petroglyphs Historic State Park

Sanilac Petroglyphs Historic State Park is a state park in the U.S. state of Michigan. The park, also known as ezhibiigadek asin (Ojibwe for "written on stone") consists of 240 acres (97 ha) in Greenleaf Township, Sanilac County, in Michigan's Thumb. It contains the largest collection of Native American petroglyphs in Michigan. The carvings were created in the pre-Columbian era and represent aspects of Native American spirituality. An interpretive hiking trail within the park passes along the nearby Cass River. This historic park is co-managed by the Michigan Department of Natural Resources and the Saginaw Chippewa Nation. It was donated to the state by the Michigan Archaeological Society in 1971, and it is listed on the National Register of Historic Places.