No, this isn't the border between the human world and the land of beavers. This is just the border between the United States and Canada. Given just how long the border is, it should come as no surprise that there are quite a few noteworthy sections across it. The Slash is surely one of them. Just look at the way the trees bridge the small river flowing through two countries.
It surely is an example of a beautiful natural border. It truly is no wonder that the locals love it. If only all the borders in the world were this pretty.