The southern Ontario (lowland) region is a sedimentary basin covering ∼72 000 km2 located within the Great Lakes watershed (e.g., Sharpe et al. 2014a). It is bounded by Canadian Shield to the north and east, and three Great Lakes to the south and west (Ontario, Erie, and Huron). The region is the economic heartland of Canada accounting for over 40% of the Canadian Gross Domestic Product. It contains one-third of the Canadian population and has the highest population density in the country. The Great Lakes cumulatively account for approximately 84% of North Americas available freshwater and form...

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