The longest land border in the world is between Canada and the United States, stretching 8,891 kilometers (5,525 miles). From afar, it appears to be a relatively boring border – clean, crisp, and dead-straight – but a closer look reveals this territorial boundary is very strange. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

The US-Canada border has two main bits: the long border that cuts horizontally through North America with the contiguous US to its south, as well as another vertical boundary slicing between Alaska and Canada in the continent’s far northwest.

A large section of the horizontal border looks incredibly straight on most world maps. In particular, the 2,027-kilometer (1,260-mile) stretch between Lake of the Woods (Mi

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