The Weser (German) or Vesdre (French) is a river in eastern Belgium, in the province of Liège, and is a right tributary to the river Ourthe. Its source lies in the High Fens (Hohes Venn, Hautes Fagnes), close to the border with Germany near Monschau. It flows through an artificial lake (fr:Barrage de la Vesdre), and then through the towns Eupen, Verviers, Pepinster and Chaudfontaine. The Vesdre flows into the Ourthe a few kilometers from Liège. Its total length is approximately 60 kilometres (37 mi).
The water of the Vesdre has a high acidity (due to the Hautes Fagnes bogs), which made it very suitable for the textiles industry around Verviers. The Vesdre was the far eastern end of the sillon industriel, the backbone of Walloon industry. Nowadays, the water of the Vesdre is mainly used as drinking water.
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