Grosse Ile Township is a civil township of Wayne County in the U.S. state of Michigan. The population was 10,371 at the 2010 census.The township encompasses several islands in the Detroit River, of which the largest is named as Grosse Ile. Named by French explorers in 1679, Grosse Île means “Big Island”. Later taken under British rule after 1763, the island was not settled by European Americans until after the United States achieved independence in the American Revolutionary War. According to the United States Census Bureau, the township has a total area of 18.67 square miles (48.36 km2), of which 9.20 square miles (23.83 km2) is land and 9.47 square miles (24.53 km2) (50.72%) is water.
Grosse Ile is the largest island on the Detroit River. The township of Grosse Ile is composed of twelve islands, although the community is most often identified with the main island (which residents simply refer to as “The Island”). Grosse Ile’s main island is technically composed of two islands. Grosse Ile Township is one of only seven municipalities in the state of Michigan to consist entirely of islands, including St. James Township, Drummond Township, Bois Blanc Township, Mackinac Island, Peaine Township, and Sugar Island Township. The tip of the main island’s northern section is named Hennepin Point in honor of the 17th-century French explorer Father Louis Hennepin.
information provided by wikipedia.org