I had assumed that fortifications can only be constructed on townslands, cities and strongholds. I seem to be able to build them in a mountain region. I say "seem" because I haven't actually tried, but if I click "Build Fortifications" in the "Command" menu, I get this:
There are no fortifications here, but you can build a new fort. You will need to construct 5 "blocks" to complete construction.
Each block will cost 86 gold to construct. You can build up to two blocks per day (one per turn).
Is this intentional? The region is Bym, at Beluaterra.
