Ammophila breviligulata is a species of grass native to eastern North America, where it grows on sand dunes along the Atlantic Ocean and Great Lakes coasts. Beachgrass thrives under conditions of shifting sand, sand burial, and high winds; it is a dune-building grass that builds the first line of sand dunes along the coast. Beachgrass is less vigorous in stabilized sand, and is only infrequently found further inland than the coastal foredunes. On the Atlantic coastline of North America, Ammophila breviligulata has been observed as far south as North Carolina, and is often planted in dune restoration projects. Ammophila breviligulata was introduced to the Pacific coast of North America in the 1930s. It is proving to be invasive, and is increasingly important to coastal ecology and development in Oregon, Washington, and British Columbia.

Kohler-Andrae State Park comprises two adjacent Wisconsin state parks located in the Town of Wilson, a few miles south of the city of Sheboygan. They are managed as one unit. Terry Andrae State Park, established in 1927, and John Michael Kohler State Park, established in 1966, total 988 acres (4.00 km2). The parks contain over two miles (3 km) of beaches and sand dunes along the shore of Lake Michigan, with woods and wetlands away from the water. The Black River flows through the parks.