Alpes occidentales
Piedmontese refers to the languages spoken in the region of Piedmont and the north west corner of Liguria. Historically, the Piedmontese-speaking area is the plain at the foot of the Western Alps, and ends at the entrance to the valleys where Occitan and Arpitan are spoken. In recent centuries, the language has also spread into these valleys, where it is also more widely spoken than these two languages, thus the borders of Piedmontese have reached the western alps watershed that is the border with France.