The Sauer flows through Belgium, Luxembourg, and Germany, and is a western tributary of the Moselle. Both rivers form part of the catchment area of the Rhine.
Over its course of 173 km, the Sauer flows along large parts of the border between Belgium and Luxembourg, and then marks the border between Germany and the Grand Duchy.
Winding its way through the country south of the Luxembourgish Ardennes, the Sauer is the main tributary of the Moselle.
The Sauer and Upper-Sauer lake, which was dammed at Esch-sur-Sûre, are Luxembourg’s main drinkable water supply. For us, the Sauer stands for health, nature and vitality.