Tobico Marsh, located just north of Bay City, Michigan, is part of the Bay City Recreation Area. Tobico Marsh was designated as a registered National Natural Landmark in 1976 because of its large size, relatively undisturbed condition and variety of aquatic plant life. With nearly 2,000 acres (8.1 km2) of wetland woods, wet meadows, cattail marshlands and oak savannah prairies, Tobico Marsh is one of the largest remaining freshwater, coastal wetlands on the Great Lakes.