Ostrov — zaścianek in Polock county Vitebsk Governorate of the Russian Empire.
Information presented on the Radzima.net: 
Orthodox parish to which the zaścianek Ostrov belonged at the beginning of the 20th century;
metrical books of the Orthodox parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
Location of the zaścianek Ostrov
— geographic coordinates and depiction of the zaścianek Ostrov on early-20th-century detailed maps, modern maps, and satellite imagery (Google Maps). Administrative affiliation of the zaścianek Ostrov
— the administrative-territorial units to which the settlement belonged in different historical periods:— Russian Empire (1870-1910s), Orthodox parish to which the zaścianek Ostrov belonged at the beginning of the 20th century;
metrical books of the Orthodox parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
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