The Paris Basin, shielded as it was by the Alps, Pyrenees, Ardennes, and Jura along France's borders, exemplifies the concept of a:

Name: The Paris Basin, shielded as it was by the Alps, Pyrenees, Ardennes, and Jura along France's borders, exemplifies the concept of a:
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A "folk fortress" refers to a region naturally protected by its geographical features, such as mountains, which is the case with the Paris Basin being shielded by the Alps, Pyrenees, Ardennes, and Jura.

The Paris Basin, Shielded as It Was by the Alps