Tremmen  Tremmen is a village in Brandenburg, Germany, situated in the district of Havelland. It is one of the civil parishes ("Ortsteile") of the town of Ketzin. The village was founded in 1161 with the name of "Tremene". Still October 26, 2003 it was an autonomous municipality than merged in Ketzin. Tremmen is situated in the geographical region of Nauener Platte, not too far from the western borders of Berlin and its metropolitan region and by the road linking Wustermark and Brandenburg an der Havel. It lies 6 km from Ketzin, 5 from Wustermark, 15 from Nauen, 20 from Potsdam and circa 30 from Rathenow.