I recently did an illustrated map of Lake Ontario and the Golden Horseshoe region published in the Fall 2015 edition of ON Nature magazine.
The map depicts the shoreline of the ancient Lake Iroquois, a freshwater lake that drained into the Atlantic with the retreat of the glaciers and left behind what is now Lake Ontario. The article explores the unique features that it left behind. As a resident of this area, it was interesting to learn that myself and most of the population of Ontario are living where a lake once was!
You can read the accompanying article in the digital version of ON Nature Magazine here (my map is on the following spread).