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The Alzette (Luxembourgish: Uelzecht, German: Alzig) is a river with a length of 73 kilometres (45 mi) in France and Luxembourg. It is a right tributary of the Sauer.

Alzette
Luxembourg BW 2016-09-15 12-44-12.jpg
The Alzette winding through Grund, Luxembourg
Location
CountryFrance, Luxembourg
Physical characteristics
Source 
 - locationThil
 - elevation305 m (1,001 ft)
Mouth 
 - locationEttelbruck 49°50′53.5″N 6°6′43″E / 49.848194°N 6.11194°E / 49.848194; 6.11194 (Alzettemouth)Coordinates: 49°50′53.5″N 6°6′43″E / 49.848194°N 6.11194°E / 49.848194; 6.11194 (Alzettemouth)
Length73 km (45 mi)
Basin features
ProgressionSauerMoselleRhineNorth Sea
River systemRhine
Tributaries 
 - leftMess, Pétrusse, Eisch, Attert, Wark

It rises in Thil near the town Villerupt in the Meurthe-et-Moselle département, France. It crosses the border with Luxembourg after a few kilometres. At Lameschmillen (near Bergem) it is joined by the Mess. It flows through the Luxembourgish towns Esch-sur-Alzette, Luxembourg City and Mersch, and empties into the Sauer near Ettelbruck.

The Sauer is a tributary to the Moselle.