The Spree is a river that flows through the Saxony, Brandenburg and Berlin states of Germany, and in the Ústí nad Labem region of the Czech Republic. It is a left bank tributary of the River Havel and is approximately 400 kilometres (250 mi) in length. The reach of the river between the Dämeritzsee and Müggelsee to the east of Berlin is known as the Müggelspree.
The source of the Spree is located in Neugersdorf, Germany, in the Lusatian Highlands (Lausitzer Bergland) near the Czech border. It runs on the boarder for a short distance at two points (near Ebersbach and Oppach) before leaving the hills and passing through the old city of Bautzen/Budyšin, the center of the Sorbs in Upper Lusatia. Just to the north of Bautzen the river flows through the Bautzen Reservoir. Further north the river passes through the city of Spremberg and the Spremberg Reservoir before reaching the city of Cottbus. To the north of Cottbus the river enters the Spreewald, a large wetlands area in Lower Lusatia.