Granite Island is a 2.5-acre (1.0 ha) island in Lake Superior located about 12 miles (19 km) northwest of Marquette in the Upper Peninsula of the U.S. state of Michigan. Posted upon it is the Granite Island Lighthouse, also known as Granite Island Light Station, and is "one of the oldest surviving lighthouses on Lake Superior".[2] It is part of Marquette Township, in Marquette County.