I have to admit this month's lite challenge has made voting very hard for me - all the entries are fascinating, interesting, different and well-made. They all have something to recommend them. I'd write up a more detailed review of all the works, but I'll keep that for later. So, for now, congratulations to all the participants!
EDIT: OK, it's later. I, too, voted for Octopod's caves. All the maps had something to recommend them, but to my mind the caves made the best use of the blots to create a map that is both a bit fantastic and eminently plausible. The blots become an inherent part of the map, they fit in perfectly and yet a person looking at the map on its own would never see them. Also, the trees on top were really cool and it felt like a long time since I'd seen a nice fantasy map drawn side-on.