The Polish Corridor, also known as the Pomeranian Corridor, was a territory located in the region of Pomerelia, which provided the Second Polish Republic with access to the Baltic Sea, thus dividing the bulk of Weimar Germany from the province of East Prussia. At its narrowest point, the Polish territory was just 30 km (19 mi) wide. The Free City of Danzig, situated to the east of the corridor, was a semi-independent German speaking city-state forming part of neither Germany nor Poland, though united with the latter through an imposed union covering customs, mail, foreign policy, railways as well as defence.