Line by Line: mapping unknown territory

Still working on the map(s).   Still finding it scary, where there's no record of what I drew 25 years ago (no findable record...I know the maps are still there somewhere...)    

How far north of the mountains is the valley of the Honnorgat, compared to how far south of the mountains the confluence of Imefal and Immer?    That was a problem even then, and I guesstimated it, and I'm guesstimating it again, but (as the only other person now alive who saw the original map is certain) I've now shift