 Historically, Silesia was bounded to the west by the Kwisa and Bóbr Rivers, while the territory west of the Kwisa was in Upper Lusatia (earlier "Milsko").However, because part of Upper Lusatia was included in the Province of Silesia in 1815, in Germany Görlitz, Niederschlesischer Oberlausitzkreis and neighbouring areas are considered parts of historical Silesia.Those districts, along with Poland's Lower Silesian Voivodeship and parts of Lubusz Voivodeship, make up the geographic region of Lower Silesia.