It's not, though, is the thing?
The effective boundary of Roman rule in the region was the Rhine. Most of the Rhine runs through Germans and the Netherlands; it forms the German border only along the French regions of Alsace and Moselle, which are historically German-speaking. Flanders, Luxemburg and German-Switzerland also sit on the "Roman" side of the Rhine, and Austria, while on the far-side of the Rhine, was largely within the Empire. "Roughly", at this point, involves ignoring hundreds of thousands of square miles, millions of people, indeed, ignoring entire countries.
Yes, but my point was that the area was *generally* conterminous. No cultural phenomenon stays the same for two millennia. Our nationalist could argue that the cultural border shifted with the migrations and evolution of European states, but that it is really a product of Roman rule.
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