Everyone thinks the Great Lakes are just five massive lakes on the U.S.–Canada border. But that’s only a small part of a much bigger story. When you zoom out, you’ll discover a massive freshwater system stretching deep into Canada, shaped by ancient rock, glaciers, and elevation changes over billions of years. This video explains how the Canadian Shield, Ice Ages, and geology combined to create the Great Lakes — and why their position is anything but accidental. Earth’s history is written in wat