The Alzette (French pronunciation: [alzɛt]; Luxembourgish: Uelzecht [ˈuəltsəɕt] ^ⓘ; 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.

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Alzette
The Alzette winding through Grund, Luxembourg
Course of the Alzette
Location
Countries	France Luxembourg
Physical characteristics
Source
• location	Thil
• elevation	305 m (1,001 ft)
Mouth	Sauer
• location	Ettelbruck
• coordinates	49°50′54″N 6°6′43″E
Length	73 km (45 mi)
Basin features
Progression	Sauer→ Moselle→ Rhine→ North Sea
Tributaries
• left	Mess, Pétrusse, Eisch, Attert, Wark

Close

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).^[1] 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 rocky cliffs above the Alzette in Luxembourg City are called 'Bock'. This name was given to the Casemates du Bock;^[2] a honeycomb of tunnels colloquially named 'Paula', which runs under the ruins of the Fortress of Luxembourg. The fortress protected the city of Luxembourg for centuries until it began to be dismantled in 1867.