At a glance, nothing peculiar stands out about Minnesota on a map. It’s when you take a longer look that you’ll notice it. Along the northern border there is a small piece of land that looks like it should be part of Manitoba, Canada marked as territory of Minnesota, and the United States. However, this piece of land is not physically connected to the United States at all, it is surrounded by Canada on three sides, and Lake of the Woods on the other. Visitors either have to travel by boat across Lake of the Woods, or cross the Canadian border at Warroad, then cross back into the United States once they reach The Angle.
The mapping oddity that gave this 123-square-mile chunk of land to the United States happened when land negotiators were deciding where the USA/Canada border should be set. The Mitchell Map was used during negotiations — it mistakenly showed that the Mississippi River originated in Lake of the Woods. Understandably, the United States wanted to make sure the headwaters of the Mississippi River remained in the United States, so the border was set at the very northwestern tip of Lake of the Woods, ran due south to the 49th parallel, and then continued west. Because of this, the Northwest Angle became part of Minnesota.