I’m going to go out on a limb and say, I believe Version 6.0 is the most understandable illustration of basic geography ever produced.
On this Central Arizona detail, notice how easily you can see the terrain, and at the same time, read the lines and type. This ability to see the interwoven patterns of land, water and humanity is the basis of geographic comprehension.
Version 6.0 makes geographic understanding and appreciation possible for the general population.