The Malxe ( Lower Małksa ) is an originally about 45 km long river in Lower Lusatia, whose upper reaches were separated in the 1980s by the mining Jaenschwalde from underflow.
It rises some 130 m above sea level. Sea level at the foot of the high mountain, the highest point of Muskau arc at Döbern. Furthermore, feed it receives with the Tzuschka ( Busch ditch ) and the Gusnitza from the Gosdaer Heath, and from the Preschener Mühlbusch and the Preschener source. In Forst ( Lausitz) it reaches the Lusatian glacial valley 70 m above sea level. NN. In the 19th century there were north of forestry in today eingemeindeten villages Bohrau and Briesnig a connecting trench of the Malxe the Neisse. Since the interruption of the natural river course all the water of the upper course passes through this gap in the Neisse only four kilometers away.
Because a entstandenem by natural levee sediments, the Malxe the Glogau - Baruth glacial valley followed earlier northwestward toward Peitz. The independently become 22 kilometers underflow begins near Heinersbrück good 61 meters above sea level. NN in Vorspreewald. About 700 meters east of Fehrow reached the Malxe the upper Spree forest, where they created in the 16th century with the Hammergraben 57 m above sea level. NN united to Great flow. Meanwhile, water is routed according to requirements and the water level in the Spreewald in Nordumfluter, an artificial Spreearm or supplied via a culvert to the original course.
On November 10, 2011 the ground was broken and thus the start of extensive earthworks for a natural relocation of Malxe on the territory of the former coal mining area, now a poured and compacted tilting surface. With the first approximately 650 meter long section was begun between Briesnig and Bohrau and will finish the work later in Heinersbrück. Within ten years, the existing gap closed by about six kilometers and the connection between the upper and lower reaches should be restored.