To throw an idea out there -
There is a river valley south of Fort RoundTop, vulnerable to evil Thaneland raiders, perhaps a dark captain enthralled by a terrible sorcerer.
What do you think Redrobes? It would be small scale (detailing ruins and some countryside) but I'd prefer a heightmap from you and some guidance on what that terrain would look like (wiki picture maybe?) and anything you'd recommend. I'm thinking Irish countryside castle which I have some big photos of.