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The Sauer (German and Luxembourgish, German pronunciation: [ˈzaʊ̯ɐ] ^ⓘ, Luxembourgish: [ˈzɑʊɐ] ^ⓘ) or Sûre (French, French pronunciation: [syʁ] ^ⓘ) is a river in Belgium, Luxembourg and Germany. A left tributary of the Moselle, its total length is 173 kilometres (107 mi).

Sauer
The Sauer in Echternach
Path of the Sauer [1]
Location
Countries	Belgium Germany Luxembourg
Reference no.	DE: 262
Physical characteristics
Source
• location	Source region: In the Ardennes on the soil of Libramont-Chevigny near the Planchipont farm (Belgium)
• elevation	ca. 510 m (1,670 ft)
Mouth
• location	Between Wasserbilligerbrück (Germany) and Wasserbillig (Luxembourg) into the Moselle
• coordinates	49°42′49″N 6°30′24″E / 49.7135889°N 6.5066861°E / 49.7135889; 6.5066861
• elevation	ca. 133 m above NHN
Length	173 km (107 mi)
Basin size	4,259 km2 (1,644 sq mi)
Discharge
• location	at its mouth[1]
• average	53.8 m3/s (1,900 cu ft/s)
Basin features
Progression	Moselle→ Rhine→ North Sea
River system	Moselle

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 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 Luxembourgish 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.