Grand Mere State Park is a state park in the southwestern part of the U.S. state of Michigan near Stevensville. It is located adjacent to Interstate 94. Protected from Lake Michigan by the dunes to the west, the park has many natural features not found throughout the rest of the state. In 1976 it was designated a National Natural Landmark. The 985-acre park is mostly wooded and has three geologically ancient inland lakes, left behind as the glaciers receded during the last ice age.