High Quality Content by WIKIPEDIA articles! Podlachia, Podlasie or Podlesia (Polish: Podlasie, Belarusian: Падляшша Padlyashsha) is a historical region in the eastern part of Poland and western Belarus. It is located between the Biebrza River in the north and its natural continuation to the south — the Polesie area. At present Podlachia is used primarily in reference to the Polish part of the region, which is traditionally divided between the northern (north of Bug River) and southern Podlasie. The northern part of Podlasie is included in the modern Podlaskie Voivodeship.