Good. If member states would be 100% free to assign citizenship, you can get some terrible ideas. For example: give all unwanted migrants citizenship, under the condition that they do not stay in your country.

A lot of treaties only work under the assumption that the definition of citizenship stays what we know it as right now. Protecting that definition means protecting the EU treaties.

According to wikipedia, Noord Brabant and Drenthe. My “research” hasn’t gone any deeper than that.

Source: https://nl.m.wikipedia.org/wiki/Lijst_van_hoogste_punten_in_het_Koninkrijk_der_Nederlanden

The only reason the Netherlands has that high a number, is because of the hill on which the Dutch, German, and Belgian borders meet. If you take Limburg out of the equation, the next highest point is 110 meters.

In two of the Dutch provinces, the highest point is a garbage dump hill.