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The Bay of Green Bay is an arm of Lake Michigan. It is located on the south-west coast of Michigan's Upper Peninsula and the east coast of Wisconsin. The Bay of Green Bay is some 120 miles long, with a width ranging from about 10 to 20 miles. At the head of the bay is the city of Green Bay, Wisconsin, where the Fox River enters the bay. The Tower Drive bridge spans the point where the bay ends and the Fox River begins. The bay is navigable by large ships.
Interestingly enough, the bay is officially named after the city, not vice-versa; hence the name Bay of Green Bay.