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It divides the North American continent along one continuous stretch from the Pacific to the Atlantic Oceans, with another weird section separating Alaska from mainland Canada. The total length of the border across land and water is 8,891 km (5,525 miles) including the 2,477 km (1,396 miles) that run along Alaska’s edge.
What makes it bizarre
While it is a huge stretch of land, that’s not really what makes it bizarre. Not even the fact that it’s unprotected makes it all that strange; there are big, undefended borders in lots of places, although it’s getting rarer all the time.
In order to understand why the border is so weird, we need to go back in time to see how the border was created.