Brštanik is a village in the municipalities of Berkovići, Republika Srpska, and Stolac, the Herzegovina-Neretva Canton, the Federation of Bosnia and Herzegovina, Bosnia and Herzegovina.Official results from the book: Ethnic composition of Bosnia-Herzegovina population, by municipalities and settlements, 1991. census, Zavod za statistiku Bosne i Hercegovine - Bilten no.234, Sarajevo 1991.
Demographics According to the 2013 census, only one Croat was living in the Berkovići part with no one living in the Stolac part.
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