Before coming to this forum I decided it was impossible (for me at least) but now that I have been here a while I can see it would probably be quite simple. Most of the features are denoted with swathes of colour besides the mountains. I would think that several of the talented artists who specialize in "satellite" type maps here could do this up with little problem.
In fact, I would go so far as to say there are more than a few maps on this site that are better than this one.
My style has been evolving towards this but hasn't gotten there yet. It's primarily artistic hand-painted color swashes, some filters, some grunge brushes, some shaded relief mountains, and lots of tweaking.
If the radiance of a thousand suns was to burst at once into the sky, that would be like the splendor of the Mighty One...I am become Death, the Shatterer of worlds.
-J. Robert Oppenheimer (father of the atom bomb) alluding to The Bhagavad Gita (Chapter 11, Verse 32)
My Maps ~ My Brushes ~ My Tutorials ~ My Challenge Maps
You are being modest, sir.