The Attert is a river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 flowing through Belgium

Belgium

Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...

 and Luxembourg

Luxembourg

Luxembourg , officially the Grand Duchy of Luxembourg , is a landlocked country in western Europe, bordered by Belgium, France, and Germany. It has two principal regions: the Oesling in the North as part of the Ardennes massif, and the Gutland in the south...

, left tributary of the Alzette

Alzette

The Alzette is a river with a length of 73 kilometers in France and Luxembourg. It is a right tributary of the Sauer.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. In Lameschmillen it is joined...

. Its length is 38 km, of which 32 km are in Luxembourg, and 6 km in Belgium. Its source is in Nobressart

Nobressart

Nobressart is a village in Luxembourg Province, in southern Belgium. It was previously a municipality itself, but is now part of the municipality of Attert. Nearby is the source of the Attert River....

, north-west of Arlon, in the Belgian province Luxembourg. It flows into the river Alzette

Alzette

The Alzette is a river with a length of 73 kilometers in France and Luxembourg. It is a right tributary of the Sauer.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. In Lameschmillen it is joined...

 at Colmar-Berg

Colmar-Berg

Colmar-Berg is a commune and town in central Luxembourg, in the canton of Mersch. It is situated at the confluence of the rivers Attert and Alzette....

. It flows through the village of Attert

Attert

Attert is a Walloon municipality of Belgium located in the province of Luxembourg.On 1 January 2007 the municipality, which covers 70.94 km², had 4,802 inhabitants, giving a population density of 67.7 inhabitants per km².The municipality falls within the Luxembourgish-speaking Arelerland and...

 in Belgium, and the towns of Redange

Redange

Redange or Redange-sur-Attert is a commune and town in western Luxembourg, near the border with Belgium. It is the capital of the canton of Redange. Redange is situated on the river Attert, a tributary of the Alzette....

, Useldange

Useldange

Useldange is a commune and small town in western Luxembourg, in the canton of Redange., the town of Useldange, which lies in the east of the commune, has a population of 622. Other towns within the commune include Everlange, Rippweiler, and Schandel....

, Boevange-sur-Attert

Boevange-sur-Attert

Boevange-sur-Attert is a commune and small town in central Luxembourg, in the canton of Mersch. It is situated on the river Attert....

, and Bissen

Bissen

Bissen is a commune and town in central Luxembourg, in the canton of Mersch. It is situated on the river Attert., the town of Bissen, which lies in the east of the commune, has a population of 2,871. Bissen is home to a steel factory, operated by Arcelor, the world's second-largest steel...

in Luxembourg.