<P> The city takes its name from the immense Thunder Bay at the head of Lake Superior , known on 18th - century French maps as Baie du Tonnerre ( Bay of Thunder ) . The city is often referred to as the `` Lakehead '' , or `` Canadian Lakehead '' , because of its location at the end of Great Lakes navigation on the Canadian side of the border . </P>
where does thunder bay get its name from
Thunder Bay at the head of Lake Superior