Lots of people say that Black Marsh has to be all ugle swamp. Why? It could have lush beautiful green lands, but the Argonians would stay away from it, as humans would stay away from making cities in lakes and oceans and marshes. Humans don't colonize everewhere, the same can be said for the Argonians, and the Empire could have a good stronghold in the Black Marsh. Mind you I havn't read my fluff up to date so I am not shure what is said about it now.