Who or what is "Silbo Gomero"?
Correct answer: A form of language from the Canary Isles

Player #16445910
In Greece also there is an area on Evoia island that people use a whistle language.

Poging Bagsik
Just wondering how a whistle form of communication can have a written form...

WalksBySelf
Poging Bagsik, they speak Spanish too