The Northern Russian dialects and those spoken along the Volga River typically pronounce unstressed /o/ clearly (the phenomenon called okanye/оканье). Besides the absence of vowel reduction, some dialects have high or diphthongal /e~i̯ɛ/ in the place of Proto-Slavic *ě and /o~u̯ɔ/ in stressed closed syllables (as in Ukrainian) instead of Standard Russian /e/ and /o/. An interesting morphological feature is a post-posed definite article -to, -ta, -te similarly to that existing in Bulgarian and Macedonian.