Mainz-Laubenheim(Germany)
Editor of DKAR 1:127 suggests location is Nubenheim, settlement near Mainz. German Wikipedia and Mainz-Laubenheim website (http://www.mz-laubenheim.de/node/2) identify Nubenheim as former name of Mainz-Laubenheim.
Nahe (river)(Natural Landmark)
Left tributary of the Rhine.
Obereschenbach(Germany)
Editor of DKAR 1:116 identifies location as Obereschenbach and Untereschenbach, villages 2 km apart.