Øyeren
It is located within the municipalities of Enebakk , Skedsmo , Fet , and Rælingen in Akershus county and Spydeberg and Trøgstad municipalities in Østfold county . 
<triplet> Skedsmo <subj> Akershus <obj> located in the administrative territorial entity <triplet> Fet <subj> Akershus <obj> located in the administrative territorial entity <triplet> Akershus <subj> Enebakk <obj> contains administrative territorial entity <subj> Skedsmo <obj> contains administrative territorial entity <subj> Fet <obj> contains administrative territorial entity <subj> Rælingen <obj> contains administrative territorial entity <triplet> Spydeberg <subj> Østfold <obj> located in the administrative territorial entity <triplet> Trøgstad <subj> Østfold <obj> located in the administrative territorial entity <triplet> Østfold <subj> Spydeberg <obj> contains administrative territorial entity <subj> Trøgstad <obj> contains administrative territorial entity