a strip of land near the mouth of the Vistula River: formerly separated Germany from East Prussia; given to Poland in the Treaty of Versailles 1919 to provide it with access to the Baltic.
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British Dictionary definitions for polish corridor
the strip of land through E Pomerania providing Poland with access to the sea (1919–39), given to her in 1919 in the Treaty of Versailles, and separating East Prussia from the rest of Germany. It is now part of Poland
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012