Zone interdite in the context of Zone occupée

The zone libre (French pronunciation: [zon libʁ], free zone) was a partition of the French metropolitan territory during World War II, established at the Second Armistice at Compiègne on 22 June 1940. It lay to the south of the demarcation line and was administered by the French government of Philippe Pétain based in Vichy, in a relatively unrestricted fashion. To the north lay the zone occupée ("occupied zone"), in which the powers of Vichy France were severely limited.

In November 1942, the zone libre was invaded by the German and Italian armies in Case Anton, as a response to Operation Torch, the Allied landings in North Africa. Thenceforth, the zone libre and zone occupée were renamed the zone sud (southern zone) and zone nord (northern zone) respectively. From then on both were under German military administration.

The Military Administration in Belgium and Northern France (German: Militärverwaltung in Belgien und Nordfrankreich) was an interim occupation authority established during the Second World War by Nazi Germany that included present-day Belgium and the French departments of Nord and Pas-de-Calais. The administration was also responsible for governing the zone interdite, a narrow strip of territory running along the French northern and eastern borders. It remained in existence until July 1944. Plans to transfer Belgium from the military administration to a civilian administration were promoted by the SS, and Hitler had been ready to do so until Autumn 1942, when he put off the plans for what was intended to be temporary but ended up being permanent until the end of German occupation. The SS had suggested either Josef Terboven or Ernst Kaltenbrunner as the Reich Commissioner of the civilian administration.