<Li> Lake Winnebago, connected to Green Bay by the Fox River, serves as part of the Fox--Wisconsin Waterway and is part of a larger system of lakes in Wisconsin known as the Winnebago Pool . </Li> <Li> Grand Traverse Bay is an arm of Lake Michigan located on Michigan's west coast, being one of the largest natural harbors in the Great Lakes . The bay has one large peninsula and one major island known as Power Island . Its namesake is derived from when Jacques Marquette crossed the bay from Norwood to Northport calling it La Grande Traversee . </Li> <Li> Georgian Bay is an arm of Lake Huron, extending northeast from the lake entirely within Ontario . The bay, along with its narrow westerly extensions of the North Channel and Mississagi Strait, is separated from the rest of the lake by the Bruce Peninsula, Manitoulin Island, and Cockburn Island, all of which were also formed by the Niagara Escarpment . </Li> <Li> Lake Nipissing, connected to Georgian Bay by the French River, contains two volcanic pipes, which are the Manitou Islands and Callander Bay . These pipes were formed by a violent, supersonic eruption of deep - origin . The lake lies in the Ottawa - Bonnechere Graben, a Mesozoic rift valley that formed 175 million years ago . </Li>

What is the name of the glacier that carved the great lakes