From Daniel Pipes:
The 751 No-Go Zones of France
They go by the euphemistic term Zones Urbaines Sensibles, or Sensitive Urban Zones, with the even more antiseptic acronym ZUS, and there are 751 of them as of last count. They are conveniently listed on one long webpage, complete with street demarcations and map delineations.
What are they? Those places in France that the French state does not control. They range from two zones in the medieval town of Carcassone to twelve in the heavily Muslim town of Marseilles, with hardly a town in France lacking in its ZUS. The ZUS came into existence in late 1996 and according to a 2004 estimate, nearly 5 million people live in them.