Chakavian
Chakavian in its actual use is the least spoken Serbo-Croatian dialect, being spoken only by 12% Croats. It is now mostly reduced in southwestern Croatia along the eastern Adriatic: Adriatic islands, and sporadically in the mainland coast, with rare inland enclaves up to central Croatia, and minor enclaves in Austria and Montenegro. All areas of old contacts with Romance languages.
Vlachs in the history of Croatia
The Vlachs were predominantly Orthodox Christian by religion, and also, the traditional social grouping of Vlachs was the Orthodox group itself. The Orthodox Vlachs spoke the Eastern Herzegovinian dialect while the Catholic Vlachs (the Bunjevci), spoke the Western Herzegovinian dialect. The Vlachs were also called on some occasions as "Rasciani sive Serviani" and "Valachicae seu Rascianae gentis", which was an exonym for the Serbs or Orthodox Christians. In the 1500–1800 period in Europe, the religious difference was one of the main cultural differences in ethnic groups. The state triangle at Lika in what is today Croatia was an area in which Roman Catholicism, Serbian Orthodoxy, and Islam met. Ethno-confessionally, the Orthodox Vlachs were part of the Serb identity since the mid 16th-century.