[Arralen]

"farm" means (IIRC) 1,5x pop, 0,5x ressources. "Plains" is just that - plain - it's the base for everything else, you can't have "Plains & Farmland".

All terrain modifiers add up, though. (Or mayb they even multiply. I'll have to do all the number checking some day, unless the devs tell us). That means, creating a province that is both farm land and mountain does not make any sense, as the boni cancel each other out (mostly. In fact, I found this combo to suck most - no pop, but no ressources either.)

So I recommend for mapmakers is to use special terrain and "small" provinces sparingly. Going overboard with these will result in a map that lets everyone move only 1 prov/turn everywhere - with 'armies' not bigger than 50 Inf because there isn't either sufficient money nor supplies for more units.

Do not draw provinces first, and then check what terrain they have ("ok - it's mountains to the left, tick it, grass in the north, tick it, it's small, ok, oh, and here's a swamp, just another tick in the editor .."). Draw your map, then place the borders at the edges of terrain features (as it's done with the original Illwinter maps).