For other uses, see Sauer (disambiguation).
The Sauer in Echternach
Location Belgium (B), Germany (GE), Luxembourg (L)
Reference no. DE: 262
Length 173 km
Source region In the Ardennes on the soil of Libramont-Chevigny near the Planchipont farm (B)
Source height ca. 510 m
Mouth Between Wasserbilligerbrück (GE) and Wasserbillig (L) into the Moselle
49°42′49″N 6°30′24″E / 49.7135889°N 6.5066861°E / 49.7135889; 6.5066861
Mouth height ca. 133 m above NHN
Descent ca. 377 m
Basin Moselle
Progression Moselle Rhine North Sea
Catchment 4,259 km²
Discharge[1] at its mouth Average mid:   53.8 m³/s

The Sauer (German, Luxembourgish) or Sûre (French) is a river in Belgium, Luxembourg and Germany. A left tributary of the river Moselle, its total length is 173 kilometres (107 mi).

Rising near Vaux-sur-Sûre in the Ardennes in southeastern Belgium, the Sauer flows eastwards and crosses the border with Luxembourg near Martelange. It forms the border between Belgium and Luxembourg for 13 kilometres (8 mi) north of Martelange. West of Esch-sur-Sûre it flows into an artificial lake, the Upper Sûre Lake created by the Esch-sur-Sûre Dam, which gives its (French) name to the Luxembourgian commune of Lac de la Haute-Sûre. After flowing through Ettelbruck and Diekirch, the Sauer forms the border between Luxembourg and Germany for the last 50 kilometres (31 mi) of its course, passing Echternach before emptying into the Moselle in Wasserbillig. The rivers Wiltz, Alzette, White Ernz, Black Ernz, Our, and Prüm are tributaries.


  1. Added gauge data from Bollendorf (Sauer), Prümzurlay (Prüm) und Alsdorf-Oberecken (Nims), increased by the remaining catchment area (199 km²) with a conservatively estimated mq of 10

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