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The Klein Köriser See is a naturally formed water body on the territory of the municipality Groß Köris in the district Dahme-Spreewald in Brandenburg.

Location and description
The lake belongs to the lake chain of the Teupitzer Gewässer, which reaches from the Teupitzer See in the west to the Dahme in the east, and lies in the nature park Dahme-Heideseen. It extends in a northeast-facing arch with a water area of 158 hectares. The inflow is from the Kleiner Moddersee via the Moddergraben from the west, the outflow from the Hölzernen See below the Bundesstraße 179. The water body lies northeast of the community centre of Groß Köris. To the north, the district of Pätz joins the community of Bestensee. It is followed clockwise by the residential area Neubrück, the district Klein Köris, the community centre and the residential area Wilhelminenhofer Weg. The next larger towns are Schwerin (about 4.9 km) and Halbe (about 6.5 km).

History
While the lake is of natural origin, the Moddergraben was artificially created in 1749. This allowed raw materials such as wood and building materials, such as bricks from the region's brickworks, to be transported by water to Berlin. At about the same time, further ditches were created which drain into the Klein Köriser See, such as the Stintgraben and Koynegraben in the east and the Löptener Hauptgraben in the south. In this way, farmers wanted to make the damp meadows usable for agriculture.