Thank you all kindly for your encouraging comments. I built that map based on my 3D World, and now I'm starting to wonder how it would be to do it the other way round and build a 3D world based on a map. I need to do that for my next big landmass-mod, because the geography in my current land really stinks. The geography was only created to make for an impressive game, and not to be realistic in any way. Designing a map first, and THEN the 3D world, would mean that I'd have a lot more time to make the geographical considerations; like realistic and correct rivers, mountain ranges, city placement and those kind of things.