South Slavic dialect continuum
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The South Slavic dialect continuum covers the languages spoken from Slovenia to northern Greece. It extends west as far as the Black Sea and east as far as Albania. The standard languages in this continuum are: Slovenian, Serbian, Bosnian, Croatian, Macedonian, Bulgarian, and the slavic language spoken in northern Greece.
The continuum may be split into Eastern and Western branches, although there is no definite border. The eastern branch includes Bulgarian, Macedonian, and the slavic language spoken in northern Greece. The western branch includes Slovenian, Serbian, Bosnian, and Croatian.