The Sauer (German language, German and Luxembourgish language, Luxembourgish, , ) or Sûre (French language, French, ) is a river in Belgium, Luxembourg and Germany. A left tributary of the Moselle, its total length is . Rising near Vaux-sur-Sûre in the Ardennes in southeastern Belgium, the Sauer flows eastwards and becomes the border with Luxembourg near Martelange. It forms the border between Belgium and Luxembourg for 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 Communes of Luxembourg, 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 of its course, passing Echternach before emptying into the Moselle in Wasserbillig. The rivers Wiltz (river), Wiltz, Alzette, White Ernz, Black Ernz, Our (river), Our, and Prüm (river), Prüm are tributaries.

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The Obersauer Nature Park
International rivers of Europe Sauer basin, Belgium–Luxembourg border Germany–Luxembourg border Rivers of the Ardennes (Belgium) Rivers of the Ardennes (Luxembourg) Rivers of Rhineland-Palatinate Rivers of Belgium Rivers of Wallonia Rivers of Luxembourg (Belgium) Rivers of Luxembourg Rivers of Ettelbruck Diekirch Echternach Martelange Vaux-sur-Sûre Rivers of the Eifel Rivers of Germany Border rivers {{RhinelandPalatinate-river-stub