 M-29 is the main thoroughfare with which to reach Harsens Island which connects to St. Clair Flats Wildlife Area and the communities of Grand Point, Maple Leaf and Sans Souci via M-154 by auto ferry.After passing by the ferry docks, the road turns back to the north, paralleling the St. Clair River as it runs along the eastern side of Algonac State Park, passing through numerous riverbank communities.The road then turns to the north and runs a few blocks inland as it enters Marine City.