I'm in the middle of writing "Return to Sky" (though the title might change) and had to scrawl out a little map to help me keep things in order. I kept having the shadows fall and the sunset on the wrong side. Also I wanted make sure the geography was working with what I had set up in Where the Mountain Meets the Moon. Maybe when I finish the third book (now called Needle at Sea Bottom), I can include an elaborate, less-scrawly map!