The border ense would have some setback , land owners near the border might have their propertys divided and the river made unrechable.
![](http://www.ontournet.com/media/images/a7pic.jpg)
World's shortest international bridge. The guys house (on the left island) is in the US, while his "back yard" (on the right island) is in Canada. The bridge connecting the two therefore is a border crossing. You can't see 'em in this picture, but there are two flags on the bridge, one US, one Canadian.