|River mouth||Sauer River, at Reisdorf|
|Length||30 km (19 mi)|
The White Ernz (Luxembourgish: Wäiss Iernz, French: Ernz blanche, German: Weiße Ernz) is a river flowing through Luxembourg, joining the Sauer at Reisdorf. It flows through the towns of Larochette, Medernach and Ermsdorf. The river valley also includes the notable feature of having a twin castle from the 14th century named Larochette Castle.
- "Larochette Castle". Retrieved 22 November 2014.