 A defining characteristic of the Southwestern dialects is the gradual transition from one dialect to another, as well as to dialects which belong to other dialectal groups.For example, the Dupnitsa dialect is transitional to both the Samokov dialect and the Blagoevgrad-Petrich dialect, the Botevgrad dialect is transitional to the Eastern Bulgarian Balkan dialects, and especially to the Pirdop dialect, etc.etc.