A map of the Province of Ontario in 1958 with counties outlined in yellow. A small legend toward the upper right denotes railways, highways, trading posts, and provincial parks. An index in the bottom left corner lists cities, towns, and villages with their population in the 1956 census and their regional map number, presumably for the purpose of requesting that particular map from the province. Another index in the bottom right corner lists Department of Lands & Forests administration offices, provincial parks, and improvement districts. Cities, towns and bodies of water are labelled throughout.