Ontario is the most populous province of Canada and has been in existence in one form or another since 1791 when it was created and called Upper Canada. The Archives of Ontario has an online exhibit entitled “The Changing Shape of Ontario: A Guide to Boundaries, Names and Regional Governments.” The exhibit focuses on the evolution of the province’s boundaries and administrative regions as it is depicted through maps. Most of the maps are in jpeg format and are large enough to be easily legible. The collection of county maps from the early 1950s is particularly thorough.