The greatest variety of vowel systems outside of southern Italy is found in Corsica, where the Italo-Western type is represented in most of the north and center and the Sardinian type in the south, as well as a system resembling the Sicilian vowel system (and even more closely the Carovignese system) in the Cap Corse region; finally, in between the Italo-Western and Sardinian system is found, in the Taravo region, a unique vowel system that cannot be derived from any other system, which has reflexes like Sardinian for the most part, but the short high vowels of Latin are uniquely reflected as mid-low vowels. Compare comment 1 at the blog Language Hat and comment 2.
