Lake Superior is a proper noun. Lake Superior is (1) the largest freshwater lake in the world; the deepest of the Great Lakes.
The following articles provide more information about the term Lake Superior.
Minnesota is the 14th largest state in the USA, bordered by Wisconsin, North Dakota, South Dakota, Lake Superior, and the Canadian Provinces of Ontario and Manitoba. This site includes several maps of Minnesota.
Wisconsin is the 25th largest USA state, bounded by Lake Superior to the north, Illinois to the south, Minnesota and Iowa to the west, and Lake Michigan and the state of Michigan to the east.
The following article provides recent Lake Superior-related news.