Dämeritzsee
It is located partly in the municipality of Erkner ( Oder-Spree district ) and part in Rahnsdorf , a Berliner locality in Treptow-Köpenick district . 
<triplet> Erkner <subj> Oder-Spree <obj> located in the administrative territorial entity <triplet> Oder-Spree <subj> Erkner <obj> contains administrative territorial entity <triplet> Rahnsdorf <subj> Treptow-Köpenick <obj> located in the administrative territorial entity <triplet> Treptow-Köpenick <subj> Rahnsdorf <obj> contains administrative territorial entity