The Rur, not to be confused with the Ruhr, is a river, which flows through Belgium, Germany and the Netherlands. About 80 per cent of the river is located in Germany.

The name Eifel-Rur refers to this geographical region and is sometimes used to distinguish the river from the Ruhr, which is spelled with an 'h'. On older maps, the Rur was also spelled Ruhr, i.e. with an 'h'. The 'h' was removed from the name around 1900 to differentiate the two. Remainders of the old spelling can still be found in place names such as Erkensruhr and Einruhr. The river's name is Roer in Dutch and French (but pronounced as in German); in Belgium (Wallonia) it is also known as Rour or Roule.

The Rur has its source in the "Hohes Venn" nature reserve near Sourbrodt in Belgium at 660 m above sea level. 15 km downstream, it reaches the German border south of Monschau and crosses the Eifel National Park. 39 kilometres from its source, the Rur reaches the Rurstausee (a man-made lake) and then continues on through the region of Aachen and the districts of Düren and Heinsberg in North Rhine-Westphalia.

The Rur crosses into the Netherlands near Vlodrop (NL). After another 21.5 km and a total length of approximately 170 km, the Rur, now consisting of two branches, merges with the Meuse at Roermond (which literally means "Rur mouth" or "Rur opening").