The trouble with an Augusta-Savannah district is that it's a bad CoI. Savannah is a pretty obvious fit with the other Sea Islands counties and other parts of Lower Coastal Plain. Meanwhile, Augusta is a much further inland fall line city in the vein of Macon. You can see this in the map of Georgia Regional Commissions:
That's ignoring the fact that such a district has to exclude Columbia County (or something in the Savannah suburbs) which seems like a bad CoI. Columbia is deeply part of Metro Augusta and belongs in a seat with it. You're not really fitting all of Augusta in a district when a big chunk of its metro area can't fit in.
Here's a map of the Regional Commissions in DRA:
https://davesredistricting.org/join/73735362-33f4-4cc8-a603-3fd71438e5cf
