Bayou Castine, spelled variously as Castein, Castaine, Castaign and on the earliest map, Casting. Early settlers were the Acolopissa Indians. Pottery Hill, one of their shell middens along this bayou, is on the National Register of Historic Places. The name "Castein” is an Acolopissa word meaning "flea”. The east bank of the bayou is the western boundary of Fountainebleau State Park, named after the plantation owned by Mandeville’s founder. The park is on the National Register of History Places. Bayou Castine Harbor is the home of the Battle of Lake Pontchartain State Historic Marker.