Montreal is a city in the Canadian province of Quebec and is believed to be part of where the Interface series takes place due to similarities found in the landmarks and their real-life counterparts. It currently also happens to be the city where 'U M A M I' lives.
Interface Episode 02
In Episode 02 of Interface, "Mischief" transforms into a bus and takes "Blue Guy" around what seems to be Montreal to the Montreal Fine Arts Museum. They pass many landmarks on their way that look very similar to those found in real life Montreal.