Mamajuda Island /mɑːməˈdʒuːdə/, sometimes identified as Mama Juda Island, is an American island in the Detroit River. It is located just east of the northern tip of Grosse Ile (Hennepin Point) and about 500 feet (152 m) west of the Canada–United States border. The island is part of Grosse Ile Township in Wayne County, Michigan. It is the smallest of all charted islands in the Detroit River. The former 30-acre (12 ha) island has since been lost due to erosion.