The Semois is a river flowing from the Ardennes uplands of Belgium and France towards the Meuse, of which it is a right tributary.
The source of the Semois is in Arlon, in the Belgian province of Luxembourg, close to the border with the Grand Duchy of Luxembourg. Flowing in a roughly westerly direction, it enters France after passing through the Belgian village of Bohan-sur-Semois and joins the Meuse some 10 kilometres further downstream in Monthermé. The total length of the river is 210 kilometres .
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