The supercontinent of Pangea (also spelled Pangaea) formed roughly 300 million years ago, during the Early Permian Period. It was surrounded by a global ocean called Panthalassa, and then began to break apart roughly 175 million years ago. The breakup (which had absolutely nothing to do with Jennifer Aniston or Vince Vaughn) eventually formed the continents we inhabit today.

If you were to drop today’s nations with their borders on Pangea, it might end up looking something like this:

Click the image for a larger, more legible version…
Pangea with today's international borders

Source: Massimo Pietrobon

The map’s creator is Massimo Pietrobon, someone who describes himself as “a famous explorer and cartographer of Atlantis,” and who has also challenged himself with other experiments with maps in the past. When someone noted that the scale of certain countries wasn’t exactly right, Massimo was quick to confess on his blog, “Yes, it’s just a trial, it can be better.”  In fact, he’s currently hard at work developing an updated version.