Potawatomi Islands are islands that transition from Green Bay to Lake Michigan, the largest of these is Washington Island and others include Plum Island.
The Potawatomi Islands is the most common historic name given to the string of islands that delineate the transition from Green Bay to Lake Michigan, one of the Great Lakes. The largest of these is Washington Island, in Door County, Wisconsin. Others include Plum Island, Detroit Island, Hog Island, Pilot Island, and Rock Island. 
