Kresy

Eastern Borderlands (), often simply Borderlands (, ) was a historical region of the eastern part of the Second Polish Republic. The term was coined during the interwar period (1918–1939). Largely agricultural and extensively multi-ethnic with a Polish minority, it amounted to nearly half of the territory of interwar Poland. Historically situated in the eastern Polish–Lithuanian Commonwealth, following the 18th-century foreign partitions it was divided between the Empires of Russia and Austria-Hungary, and ceded to Poland in 1921 after the Treaty of Riga. As a result of the post-World War II border changes, all of the territory was ceded to the Soviet Union, and today the area of Kresy is divided between Western Ukraine, Western Belarus, and south-eastern Lithuania.

The region gave rise to the Kresy myth, a collection of nostalgic views about the area. After the fall of Communism in Europe and dissolution of the Soviet Union a major economic conflict emerged about the real estate lost by Poland with the loss of Kresy.