The fact that Belgium and the Netherlands both have a province of Limburg is "thanks" to this former fortified city on the Vesder in the current province of Liège known as Limbourg, with its beautiful centre and once the capital of a duchy, also called Limburg.
Or rather: we actually "thank" it to King William I who decided in 1815 that the current provinces of Limburg, which in Belgium largely overlap with the former county of Loon, would be given the name of this former duchy. And that despite the fact that there was virtually no overlap between the territory of Limburg that had long belonged to the former States-General of the Netherlands and the current provinces. But William I did not want the name of that duchy in the land of Herve to be lost and got his way.
Today, the former capital of the former Duchy of Limburg is, after a turbulent history, a beautiful village with a fascinating historical centre in the wonderful land of Herve and more than worth a visit, even though the character of a fortified town has somewhat disappeared over time.
And the province of Limburg in Belgium? Historically, it would have been much better called the province of Loon or, it is blasphemy, one with the province of Liège, whereby the current Limburg had little to do with Flanders and, together with Liège, was always much closer to Germany. Only many do not like to hear that historical reality.