The world would look a lot different if the supercontinent Pangaea spontaneously reunited.* Take a look at the map below, from a blog called My Laboratory of Ideas.
It's certain many of these national borders wouldn't even exist as they do today if Pangaea never split. But it's still interesting to think about.
*The original version of this post included a reference to the Ebola epidemic's location on the map, which caused understandable offense. We regret that and have removed the line. Please read our Ebola coverage here.