Reichsgau Wartheland
The "Polenlager" idea was part of Adolf Hitler's plan, known as "Lebensraum", which involved Germanization of all Polish areas annexed by Nazi Germany with the help of settlers from Bukovina, Eastern Galicia and Volhynia. The main purpose of the forcible displacement of Poles was to create a German-only enclave known as "Reichsgau Wartheland" across the formerly Polish territories.