Which Great Lake does Michigan not share a boundary with?

Michigan does not share a boundary with Lake Ontario. The Great Lakes are a group of five lakes, namely Lakes Superior, Michigan, Huron, Erie, and Ontario. While Michigan is bordered by four of these lakes, it does not have a shoreline on Lake Ontario. In fact, Lake Ontario is located to the southeast of the other lakes and is bordered by the states of New York and the province of Ontario in Canada. This geographical positioning clearly delineates that while Michigan is adjacent to Lakes Superior, Michigan, Huron, and Erie, it does not have any direct interaction with Lake Ontario, making it the correct answer.