Which two Great Lakes are joined by the Straits of Mackinac?

The Straits of Mackinac join Lake Michigan and Lake Huron.

This waterway separates Michigan’s Upper and Lower peninsulas and forms a natural connection between the two lakes. The straits are about 8 kilometres wide at their narrowest point, although the surrounding waterway is broader in places.

The Mackinac Bridge crosses the straits, linking the two peninsulas by road. Before the bridge opened in 1957, ferries were an important way for vehicles and travellers to cross between the regions. The area also has a long history of Indigenous, French, British, and American activity.

Hydrologically, Lakes Michigan and Huron are often treated as a single lake because their surfaces stand at nearly the same elevation and the connection is broad and deep. They are nevertheless conventionally listed as two separate Great Lakes.