Manitou Island is a small island in Lake Superior, off the northeastern tip of the Keweenaw Peninsula in the U.S. state of Michigan. It is part of Grant Township, in Keweenaw County. Located approximately three miles from the mainland, it encompasses around 1,000 acres (4.0 km²). Manitou has seen limited impact from human activity, due to its remote location and the often-treacherous waters caused by a strong current at the peninsula’s tip.