 For example, the border between the Duchy of Limburg and the Duchy of Luxembourg ran here and, further north, in the area of the Herzogenhügel ("Duke(s) Knoll"), between Limburg and the Duchy of Jülich.From 1815 to 1919 it divided Prussia from the United Kingdom of the Netherlands and its successor state, Belgium.In 1952 a 1.5-kilometre-long link tunnel was dug between the Hill and the Eupen Weser Reservoir, in order to better regulate the high water demand of the textile industry.