Dadau
For most of its upper course it forms the boundary between the districts of Diepholz and Vechta and for a shorter distance along its lower reaches it forms the boundary between the town of Diepholz and the collective municipality of Barnstorf . 
<triplet> Diepholz <subj> Vechta <obj> shares border with <triplet> Vechta <subj> Diepholz <obj> shares border with <subj> Diepholz <obj> shares border with <triplet> Diepholz <subj> Vechta <obj> shares border with