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The Frontenac Axis is a geological feature within Canada's Great Lakes–St. Lawrence lowlands region. This axis is a band of the Canadian Shield that extends across the St. Lawrence River, forming the Thousand Islands area. It interrupts the otherwise flat landscape of the lowlands, which are primarily composed of glacial landforms. This region is significant for its agricultural productivity, industrial activity, and high levels of urbanization. The Frontenac Axis itself is an example of the ancient bedrock of the Canadian Shield influencing the topography of the lowlands.12

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