[julenx]

The region where Basque is spoken is not gray because of its difficulty, but because there's no data [1].

[1] https://www.reddit.com/r/MapPorn/comments/7dith2/language_di...

[dordoka]

Yes, poorly explained on my comment (not native english speaker, obviously). I just wanted to point out the region where basque is spoken. Thanks for the info.

[laurentoget]

i assume that is because the FSI does not teach Basque, though i suspect the CIA may have some basque experts for surveillance purpose.