Black Ernz
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General data
- Name: Black Ernz
 - Water system: Rhine
 - Water type: River
 - Progression: Sauer (Moselle tributary) -> Moselle -> Rhine -> Waal -> Upper Merwede (Boven Merwede) -> Lower Merwede (Beneden Merwede) -> Old Meuse (Oude Maas) -> Het Scheur -> Nieuwe Waterweg (New Waterway) -> North Sea -> Atlantic Ocean -> Planet Earth
 - Climates: Continental
 - Continents: Europe
 - Countries: Luxembourg
 
The Black Ernz is a river flowing through Luxembourg, joining the Sauer at Grundhof. It flows through the towns of Junglinster and Mullerthal.