Geul (-Dutch, in German: Göhl, in French: Gueule) is a river in Belgium and the Netherlands. It is a tributary to the river Meuse. The source of the Geul is near the German-Belgian border south of Aachen at approx. 300 m altitude. After approx. 20 km it flows into the Netherlands, and after 58 km it flows into the river Meuse, north of the city Maastricht. A tributary of the river Geul is the Gulp . Towns along the Geul are Kelmis (Belgium), Valkenburg aan de Geul and Meerssen (Netherlands).