Eastern stope of the Blabbergrabenrinne/Drobschseerinne in the village Görsdorf, a part (german: Ortsteil) of the municipality Tauche in the District Oder-Spree, Brandenburg, Germany. A part of the Drobschsee and and its southern silt area, which is now flown by the Blabbergraben, is designated in the Naturschutzgebiet (protected area)/Natura 2000-area Naturschutzgebiet Schwenower Forst as Naturentwicklungsgebiet (german for: nature development area), a specially protected area, which is deprived humans influence. It is situated in the Dahme-Heideseen Nature Park, too.