Vesdre
The Vesdre or Weser and Vesder is a river in eastern Belgium, in the province of Liège. A few kilometers of the upper reaches also flow through the German municipality Roetgen. The Vesdre's total length is approximately. It is a right tributary to the river Ourthe. Its source lies in the High Fens, close to the border with Germany near Monschau. It flows through an artificial lake, and then through the towns Eupen, Verviers, Pepinster and Chaudfontaine. The Vesdre flows into the Ourthe a few kilometers from Liège.
The water of the Vesdre has a high acidity, 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.