The Nieplitz is a left tributary of the Nuthe in Brandenburg.
The river rises in the Fläming near Frohnsdorf, then takes the path through Treuenbrietzen between the villages of Niebel and Niebelhorst, as well as Buchholz and Lühsdorf, passes under the federal road 2 at the Buchholzer Mühle and then flows near Salzbrunn and Reesdorf towards Beelitz. The river crosses federal road 2 again in an arc that runs to the east, then flows parallel to federal road 246 past Schönefeld, Zauchwitz and Körzin to Stangenhagen. Shortly before the blank lake, the Nieplitz picks up the pepper flow that brings the water from the floodplains and the trench systems near Stangenhagen and Körzin. The mouth of the river lies exactly opposite the point where the relatively wide Königsgraben flows into the Nieplitz. The trench was named after Frederick the Great, who had it built in the years 1772 to 1782, so that the then considerable amount of water from the pepper flow and the swamps led faster past the following Nieplitz chain of lakes directly into the Nuthe and the land into that of Friedrich required usable stand could be moved.
The Nieplitz connects Blankensee with the Grössinsee and the small tubular Schiaßer See and flows into the Nuthe after about 50 kilometers of flow between the Gröbener Kietz and Jütchendorf. The Nuthe-Nieplitze Nature Park was set up around both rivers, with moist, green meadows, former floodplains and smaller meadows.
Source according to Wikipedia