BLACK RUSSIA CZARNORUS.
Region on the upper Neman (Belorussian and Russian) or Niemen (Polish), and its tributaries. It formed the southwest of the old Russian principality of Polotsk.
Black Russia became Lithuanian in the mid-13th century (and eventually, by union, Polish); Russian in 1795; Polish in 1920-1; Soviet 1939-41 and again from 1944.
It is now in the Hrodna (Grodno) region in Belarus.