[Agema]

It's not all bad with swamp cities is it, though? A swamp fort is completely useless except to build mages. A swamp is a sort of "dead zone" except for the above purpose. At least with a fort that has admin you also get the resources to make it useful for building troops, and the ability for the walls to last longer than it takes a pig-eating anthropomorphic wolf to huff and puff. Not only that, but the strategic synergy of fort placing to maximise resource usage might make a swamp the best location, but that a swamp fort would negate any such advantage.

I'd certainly like the option that races have a special terrain (eg. Pythium would be farmland, Caelum mountains, Ctis swamp), and that terrain allows them to build either a cheap, basic fortress-type-thing or an expensive city/citadel type thing.