The Duchy of Limburg or Limbourg was an imperial estate of the Holy Roman Empire. Much of the area of the duchy is today located within Liège Province of Belgium, with a small portion in the municipality of Voeren, an exclave of the neighbouring Limburg Province. Its chief town was Limbourg-sur-Vesdre, in today's Liège Province.

Voeren is a Flemish Dutch-speaking municipality with facilities for the French-speaking minority, located in the Belgian province of Limburg. Bordering the Netherlands to the north and the Wallonia region's Liège Province to the south, it is geographically detached from the rest of Flanders, making Voeren an exclave of Flanders. Voeren's name is derived from that of a small right-bank tributary of the Meuse, the Voer, which flows through the municipality.