In Groningen bunkers were mainly concentrated around the city of Delfzijl. The area consisted of one Stützpunktgruppe, in the end of 1944 it became part of Festung Emden. Festung Emden was devided in a Dutch part at Delfzijl, and on the other side of river Eems, the German part in and around city Emden. For the German part of this Festung, we direct you to Guide Germany.
Stahlbeton global positioning map –