Yay for bad puns as blog titles.
I can't find the post on FB which put me on to Inkarnate as a mapping app, but I'm glad they did. It's free to sign up, takes about fifteen minutes to learn all the controls, and then you're off. There are limitations (available stock art, how much you can scale it, lack of a good road texture), but it's pretty nifty. Apparently there's a proper commercial release on the way that will also allow city and dungeon mapping. Jolly good!
Here is my first attempt at mapping Averaigne with it. I need to work a bit on intermixing different scale trees, I think, and I need to rough out some more bits to fill in the map, but not bad for the time taken, imho.