The battlefields and strategic map dont show any swamps or marshes or any inland islands. I have recently learned that Alfred the Great had many inland islands surrounded by unpassable marshes (and that he used old Iron age fortifications aswell) which were used to house blacksmiths and their material etc. They were used to arm his army while fighting back the Danes.

Will there be any plan for swamps and marshes to be included into the map or would it just be to difficult and time consuming?