What is this a rough sketch of?
UPDATE: Cool Fat Michael gets on the right track, and SMS nails it: This is the border between Dollard des Ormeaux (above) and Pierrefonds (below, as it existed before municipal mergers). The gap represents Roxboro, which had been merged with Dollard in the Montreal merger, but was split and re-merged with Pierrefonds after Dollard demerged.
A broken hula hoop.
The giant gap tells me that must be the main east-west bike path.
The northern border of DDO????
… or at least that touching Pfds.
Woohoo! Finally got something
Dollard denizen for 26 years
It looks like a Ben Wicks cartoon.