A total of nine teams are relegated from the Regionalliga. As far as I know, all are by finishing positions which means that
Havelse, E. Braunschweig II, Oberneuland and Turkiyemspor drop from the Nord Region
Homburg, Arminia Bielefeld II (but not Fortuna Dusseldorf II) from the West
Wehen Wiesbaden II, Ulm and Weiden from the Sud.
The last two of these did not finish the season
I assume Fortuna II escaped on a regional basis, as Ahlen would have been in their division if they were at Regionalliga level
The ten promoted teams are
St. Pauli II from Hamburg, Meppen (Niedersachsen), Berliner AK (NOFV-Nord) and Germania Halberstadt (NOFV-Sud) - presumedly to Nord
Fortuna Koln, Rot Weiss Essen (both NRW Liga) and SC Idar-Oberstein (Sudwest) to West
Bayern Alzenau (Hessen), Waldhof Mannheim (Baden wurttemberg) and Ingolstadt II (Bayern) to Sud.
By my calculation, Koblenz will go West and Bayern II Sud, which would require one team to transfer West to Nord - Sportfreunde Lotte?
Now I sit back and wait for corrections