Toronto is covered by vast ravines and numerous creeks, all of which are part of 6 main watersheds: Etobicoke Creek, Mimico Creek, Humber River, Don River, Highland Creek and Rouge River. There are also a number of smaller watercourses that drain directly into Lake Ontario, which are grouped into the “Waterfront” watersheds.
This map shows the boundaries of the watersheds, which is courtesy of the Toronto and Region Conservation Authority. Overtop of that, I have mapped the numerous watercourses within them, both existing and lost. I created it as a resource for my many walks, so I could remember the name of whatever I was tracing. I have now published it so you can use it as a resource as well, and perhaps discover something new near you.
This is a work in progress. See a mapping error? Have a name to put to one of the unnamed tributaries? Please feel free to send me comments.