Street Sign in the Border of Soviet-German Occupied Poland

Soviet-occupied Poland began 14 metres beyond this frontier sign on the river Granitsa, June 1941 just days before Unternehmen Barbarossa. German-held Poland, the so-called Gouvernement-General, comprised the lowlands on either side of the Upper and Centra Vistula down to the south of Warsaw; in the East it extended to the River Bug and in the South to the summits of the Carpathians

Source:

Book "The Onslaught; The German Drive to Stalingrad Documented in 150 Unpublished Colour Photographs" by Max Hastings