Thunder Bay is a city located in Northwestern Ontario, Canada. It is the most populous municipality in the region with a population of 108, 359 as of the 2016 Canadian Census. The crossword solutions for the term Thunder Bay are WATCH (5 letters) and ONT (3 letters). WATCH is an acronym for 'We Are the Champions of Thunder Bay', which is a slogan used to promote the city. ONT is the abbreviation for the province of Ontario, where Thunder Bay is located.