From this U.S. city you can take a tunnel directly southwards into a Canadian city. Name both of these cities.

While we typically think of Canada as being to the north of the United States, a peculiar bend in the Detroit River creates a unique exception. The Canadian city of Windsor, Ontario, lies almost directly south of its American neighbor, Detroit, Michigan. To make this journey, travelers can use the Detroit-Windsor Tunnel, an international underwater roadway that has been connecting the two nations since it opened to traffic in 1930.

This crossing is not just a geographical curiosity; it is a vital economic artery. Along with the nearby Ambassador Bridge, the Detroit-Windsor border is the busiest commercial land crossing in North America, with billions of dollars in trade passing between the two countries each year. The two cities share a deep, interconnected history and culture, often functioning as a single metropolitan region despite the international boundary. This close relationship makes the southward trip to Canada a daily reality for thousands of commuters and a fascinating piece of trivia for the rest of us.