islands, borders the Niagara Escarpment. Because of its size and narrowness of the straits joining it with the rest of Lake Huron, which is analogous to if not as pronounced as the separation of Lake Huron and Lake Michigan, Georgian Bay is sometimes called the "sixth Great Lake".

If Georgian Bay were considered a lake in its own right, it would be the fourth largest lake located entirely within Canada (after Great Bear Lake, Great Slave Lake