Eastern Borderlands () or simply Borderlands ( ) was a term coined for the eastern part of the Second Polish Republic during the interwar period (1918–1939). Largely agricultural and extensively multi-ethnic, it amounted to nearly half of the territory of pre-war Poland. Historically situated in the eastern Polish–Lithuanian Commonwealth, following the 18th-century foreign partitions it was annexed by Russia and partly by the Habsburg Monarchy (Galicia), and ceded back to Poland in 1921 after the Peace of Riga. As a result of the post-World War II border changes, none of the lands remain in Poland today.