The Alzette (French pronunciation: [alzɛt] ; Luxembourgish: Uelzecht [ˈu̯əltsəɕt] ; German: Alzig [ˈaltsɪç]) is a river with a length of 73 kilometres (45 mi) in France and Luxembourg. It is a right tributary of the Sauer (a tributary to the Moselle), and ultimately to the Rhine.
It rises in Thil near the town Villerupt in the Meurthe-et-Moselle département, France. It crosses the border with Luxembourg after 2.7 km (1.7 mi). 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.
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