Something I struggle with is having areas of land/formations that are interesting in their own right. It's difficult to articulate, but something that just makes the land interesting. A site or feature that draws the eye and maybe tells its own little story. Perhaps that's what they refer to?

Anywho, I like the simplicity, but I can see your viewpoint of it missing something. It would be interesting to see some political or territorial boundaries, maybe with a splash of color. I'm not sure what further plans you have with this, but I hope to see them soon