Turtle Island is a 1.5-acre (0.61 ha) island in the western portion of Lake Erie in the United States. The island has an unusual political status, as its jurisdiction is divided between the U.S. states of Michigan and Ohio, even though the island has no residents or current use. Turtle Island is located about five miles (8.0 km) northeast of the mouth of the Maumee River in Maumee Bay. Today, the island houses several abandoned structures and the ruins of Turtle Island Light, a lighthouse dating back to 1866. According to the Census Bureau, most of the island physically lies in Jerusalem Township in Lucas County, Ohio with the smaller Michigan portion being part of Erie Township in Monroe County, Michigan.

Erie Township is a civil township of Monroe County in the U.S. state of Michigan. The population was 4,299 at the 2020 census. Sharing a southern border with the city of Toledo, Ohio, about 45 miles (72 km) southwest of the city of Detroit, the township is one of the southernmost areas included in the Detroit–Warren–Ann Arbor Combined Statistical Area.