What is "jeker"

The Jeker (Dutch, in French: Geer) is a river in Belgium and in the Netherlands. It is a leftbank tributary to the river Meuse. The source of the Jeker is situated near the village of Geer in the Belgian province of Liège. The river is about long, of which about is in Belgium (provinces of Liège and Limburg), and in the Netherlands (province of Limburg), where it flows into the river Meuse at Maastricht (Netherlands).

Places through which the Jeker passes are among others Waremme, Tongeren, Kanne, (all three in Belgium) and Maastricht.