Good work
Looks great!
Some things that I see are missing are:
Barrens connects to Passage of Neth
Greenlight hills connects to Sanctus Sseru
I'd classify fungus grove, scarlet desert, and twilight sea as all low level zones. You could easily make a case for zones being a different classification but then you could spend all day describing the zones and you could still get discrepencies. Maybe add a new level range of "low to mid level" for crystal caverns and "mid to high level" for first ruins?