This zone is represented in SkyDemon as an enormous surface. In reality, it is a "linear zone", without definition of lateral limits. One of the best VFR French Charts, Carta Bossy decided not to represent it, because it has almost never been activated and because legally, they consider it has not existence without a definition of lateral limits.
I fly frequently through there since that zone exists and I never found it activated, I really don't understand why they created it.
Anyway, It could be represented as a very narrow corridor, if you prefer to keep it, but for sure the big surface that appears in SD is not correct.

The current Air Million chart for France seems to display it in the same way we have done. I will write to SIA to enquire about it, but the safest thing for us to do is leave the zone as is, I think. Perhaps you could write to SIA too, to suggest they change the way that zone is defined or perhaps even remove it.

SIA replied, but their reply was not helpful. I do not really see a better way of representing the zones in SkyDemon at the moment, given the way they are published in AIP France. In my opinion their publication is wrong, but we cannot do anything about that.

OK, I will try to get a more clear answer.