What you are attempting to redo sounds like a massive project. Kudos for making it this far... some give up after they give themselves monumental challenges.

As I understand it, the attachment in your first post is an old map you are remaking? I would consider adding a texture/symbol for the ocean to make it more differentiable from the land. Since the rivers can appear like coastlines, it's easy for the observer to try to turn one of the empty planes into an ocean. Other than that... that's a lot of trees.