Looks like we have some imperial-minded, or at least very nostalgiac, map-makers.
Catalunya’s northern border hasn’t looked like this since 1659!
Apparently fewer than 4% of people in south-west France understand Catalan today- a very heavy-handed French language policy basically killed all regional dialects (not just Catalan).
From an article in yesterday’s El Pais, this map showing where Catalan is spoken:

I’ve arrived here by accident, looking for another image. Let me correct you: This map is incorrect, as northern catalnonia is not as show ( is smaller ). Also, let me correct you, in lastest statics, about 40% of population over that zone can speak catalan, and about 25% can write it.
thanks for the clarifications