It is now impossible to understand major North American cities without considering the seemingly never-ending and ever-growing sprawl of their surrounding suburbs. In The Shape of the Suburbs, activist, urban affairs columnist, and former Toronto mayor John Sewell examines the relationship between the development of suburbs, water and sewage systems, highways, and the decision-making of Toronto-area governments to show how the suburbs spread, and how they have in turn shaped the city.

Using his wealth of knowledge of the city of Toronto and new information gathered from...