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For other uses, see Sauer (disambiguation).
Sauer river.JPG
The Upper Sûre Lake, a reservoir in the upper Sauer valley.
Origin Near Vaux-sur-Sûre, Ardennes
Mouth Between Oberbillig and Wasserbillig
49°42′48″N 6°30′24″E / 49.71333°N 6.50667°E / 49.71333; 6.50667 (Sauer mouth)Coordinates: 49°42′48″N 6°30′24″E / 49.71333°N 6.50667°E / 49.71333; 6.50667 (Sauer mouth)
Progression MoselleRhineNorth Sea
Basin countries Luxembourg, Belgium, Germany, France
Length 173 km (107 mi)
Source elevation 510 m (1,670 ft)
Basin area 4,240 km2 (1,640 sq mi)
River system Rhine
Left tributaries Wiltz, Our, Prüm
Right tributaries Alzette, White Ernz, Black Ernz

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.

External links[edit]

Media related to Sauer at Wikimedia Commons