|The Ruhlander Schwarzwasser in Jannowitz|
|Location||Saxony, Brandenburg, Germany|
|Source region||in the Bernsdorf Forest near Heide, a village in the borough of Wiednitz|
|Mouth||near Ruhland into the Schwarze Elster|
|Basin||Schwarze Elster → Elbe|
It rises in the Bernsdorf Forest (Bernsdorfer Gemeindewald) near Heide, a village in the borough of Wiednitz. As it makes its way westwards, this small river flows partly through the state of Brandenburg and partly through Saxony. In the Ruhland Heath (Ruhlander Heide) it forms the boundary between the two states. There it is also joined from the left by the Saleskbach, which comes from the heath villages of Cosel, Grüngräbchen and Großgrabe.
In Arnsdorf the Sieggraben dyke branches off on the left. It also enters the Schwarze Elster, below Ruhland.