Klostersee (Lehnin)
It is located in the municipality of Kloster Lehnin , Potsdam-Mittelmark district . 
<triplet> Kloster Lehnin <subj> Potsdam-Mittelmark <obj> located in the administrative territorial entity <triplet> Potsdam-Mittelmark <subj> Kloster Lehnin <obj> contains administrative territorial entity