The Maas is a major European river, rising in France and flowing through Belgium and the Netherlands before draining into the North Sea. It has a total length of 925 km (575 mi).
The Meuse rises in Pouilly-en-Bassigny, commune of Le Châtelet-sur-Meuse on the Langres plateau in France from where it flows northwards past Sedan (the head of navigation) and Charleville-Mézières into Belgium.At Namur it is joined by the River Sambre. Beyond Namur the Meuse winds eastwards, skirting the Ardennes, and passes Liège before turning north. The river then forms part of the Belgian-Dutch border, except that at Maastricht the border lies further to the west.