Bolshoy ostrov — folwark in Nevel county Vitebsk Governorate of the Russian Empire.
Information presented on the Radzima.net: 
Orthodox parish to which the folwark Bolshoy ostrov belonged at the beginning of the 20th century;
Administrative affiliation of the folwark Bolshoy ostrov
— the administrative-territorial units to which the settlement belonged in different historical periods:— Russian Empire (1870-1910s), Orthodox parish to which the folwark Bolshoy ostrov belonged at the beginning of the 20th century;
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