dd-thunderbayThunder Bay is the most populous municipality in North Western Ontario with a population of 108,359 as of the Canada 2011 Census, and the second most populous in Northern Ontario after Greater Sudbury. The census metropolitan area of Thunder Bay has a population of 121,596

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.