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Black Ernz
Schiessentümpel waterfall
Location
Country	Luxembourg
Physical characteristics
Source
• location	Grünewald
Mouth
• location	Sauer, at Grundhof
Length	25 km (16 mi)

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.

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49°50′10″N 6°19′48″E / 49.83612°N 6.32989°E / 49.83612; 6.32989