London, ON. 2 hours from Toronto, 2 hours from Detroit, 3 hours from Buffalo. Most people around these are Leafs fans, but closer to Windsor and the border it's pretty much all Red Wings territory. No Flames fans that I know of, but you'll always see the odd hat/jersey here and there.
Generally, there is an extremely, extremely strong positive correlation between proximity to the GTA, people becoming more stupid/obnoxious/ignorant, and people being Leafs fans. I swear, for every 15 minutes you drive east on the 401 you see more and more TML garbage. God forbid any media cover literally anything other than the Leafs, too - it's the second week of October and there's already a full-page "SHOULD CARLYLE BE FIRED?" feature on the second sports page here. I don't even ****ing live in Toronto... ugh.
God, the GTA ****ing sucks. I've lived south of it my entire life and I really cannot think of any positives. I also refuse to give any money to MLSE, so the only Flames games I catch are in Detroit... used to be nice when Detroit was in the West but now I only get one shot a year to go see them.