Great Lakes-Saint Lawrence lowlands

The Great Lakes–St. Lawrence lowlands are a physiographic region in Canada, primarily encompassing the peninsula of southern Ontario. This area is bordered by the Canadian Shield and the Great Lakes (Huron, Erie, and Ontario) and extends along the St. Lawrence River to the Atlantic Ocean.1

This region is characterized by its fertile land, high agricultural productivity, significant industrialization, and a high degree of urbanization. The landscape is largely shaped by glacial activity, featuring glacial lake bottoms, till plains, and moraines. Notable features include the Niagara Escarpment and the Frontenac Axis. Northeast of the Frontenac Axis, the lowlands include the Ottawa and St. Lawrence valleys, which were once inundated by the Champlain Sea, creating a flat plain broken by the Monteregian Hills near Montreal.1

The Great Lakes themselves play a crucial role in the region's economy, offering transportation routes and supporting industries due to abundant resources like iron ore, coal, and minerals. The lakes also influence the regional climate, moderating temperatures for cooler summers and warmer winters.234