Our planned campsite (near Vaizy) was a windswept municipal field - unattended till five said the note on the door.
Half an hour's drive to our alternate and there was absolutely nothing at the GPS coordinates. We never managed to crack the mystery.
We found our current site by serendipity, en route to out third choice. Hotel Camping is owned by a Dutch couple; there is a banner supporting the Holland world cup team; flags fly. We are so deep in la France profonde that there isn't even a phone signal, let alone wifi.