This map by Dorothy Gambrell looks at US state borders formed by natural, well, borders. None of those lines drawn by a bunch of old men wearing wigs. What I really like is how those artificial borders are drawn as a thin grey line and labelled as “just some line”.
![Map of borders](https://coffeespoons.me/wp-content/uploads/2013/09/borders.gif)
Credit for the piece goes to Dorothy Gambrell.