Hi, All,
There was a map of the flows in a small addendum to the First Edition Master Atlas (the boxed set.) I'm reasonably sure that it also showed weather patterns, techtonic plate boundaries, etc, etc. Along with a glossary of Shadow World terms. (I'll have a look and see if I can find my copy- although, lord knows where it actually is.) Don't remember it showing Navigator Obelisks, though.
Be useful if the maps were available.
All the Best,
Kevin.