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Not sure that it is right to highlight Maastricht in this article. Although it is in the valley of the Maas, it is in a similar position to a town ike Lewes in England – the surrounding land is really quite high (the area is often referred to as the Dutch Alps). The real trouble is for Westland, Zuid Holland, Noord Holland and the polders around the IJsselmeer and Markermeer.
separating the wanted from the unwanted