I wandered through Old Montreal and Griffintown yesterday. Many sights were familar to me but there were others I'd never noticed before, such as the high-water mark of the flood of April 18, 1886.
I'd always thought the dividing line between Old Montreal and Griffintown was the Bonaventure Expressway. But when I was geotagging my photos at Flickr, I realized that McGill Street is actually the street that separates the two districts. That makes sense, because the original western wall of Montreal ran up what is now McGill Street. The industries that developed along the Lachine Canal were located beyond the walls in Griffintown.