Actually I think Caralain Grass has an extremely low level of population. Perrin, Egwene, Elyas and the Tinkers don't seem to encounter anyone whilst they are trudging across it in Eye of the World. Maybe small villages are on the plain further to the north (especially towards Tar Valon and the Black Hills where we know villages are located from Path of Daggers), but even so nothing very large.
I'm guessing people have access to the Big White Book for things like flags and details of armies and that sort of thing? It says pretty bleakly in there that population levels have fallen really low and certain areas including Almoth Plain, Shadow Coast, Caralain Grass, Plains of Maredo and Haddon Mirk have been depopulated to the point where they cannot support nations or even cities (Far Madding being an obvious exception).
N.B. Is Shadar Logoth going to be in the game? Don't quite know how you'd do it with the Rome rules though.
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