Bergues aire

I always use it going & coming. Never really seen it anything other than full. Ideal for walks with dogs around outside of the walls & around the allotments.
10 minute run straight in to Dunkirk for ferry.
Be aware that the town has its 'car boot' , Brocante on the middle weekend in May & you will find the road just up from the entrance sealed at both ends with artics & tractor/trailers. Way out is down the side road or through the walled town.
Another weekend guaranteed to be packed solid is the summer solstice, longest day as the town has fireworks for half an hour or more at midnight.
The actual capacity is 49 but whether that is just around the eprimeter I have no idea but they always tend to double up down the central section & last time I was there There were 10 campers on the approach road when I went out in the morning. Lovely place for me.

I second making sure you turn right before the ramparts. We didn’t on a Sunday morning and ended up in the middle of the Sunday market! That was definitely not fun!