National Geographic's Continent maps are used the world over to show a given world region or continent in the most reader friendly method possible. they use their classic border shading around each country. This map coloring scheme clearly separates each country while allowing for plenty of white background to make all the detailed cities and shaded relief stand out.
Another advantage to continent maps shown below is that they all have companion maps for other continents, the US, or the  World. By hanging both maps on the wall next to one another, they become an informative and artful decorating highlight.