| Black Ernz | |
|---|---|
Schiessentümpel waterfall |
|
| Origin | Grünewald |
| Mouth | Sauer, at Grundhof |
| Basin countries | Luxembourg |
| Length | 25 km |
The Black Ernz (Luxembourgish: Schwaarz Iernz, French: Ernz noire, German: Schwarze Ernz) is a river flowing through Luxembourg, joining the Sauer at Grundhof. It flows through the towns of Junglinster and Mullerthal.