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How did the Polish Corridor separate East Prussia from the rest of Germany?

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Treaty of Versailles The “Big Four” (left to right): David Lloyd George of Britain, Vittorio Orlando of Italy, Georges Clemenceau of France, and Woodrow Wilson of the United States, the principal architects of the Treaty of Versailles.

The Treaty of Versailles established the Polish Corridor by transferring West Prussia and most of the province of Posen from Germany to the newly reconstituted state of Poland.1

This strip of land, ranging from 20 to 70 miles wide, was designed to provide Poland with essential access to the Baltic Sea. Geographically, the corridor ran between the German province of Pomerania and East Prussia. By occupying this territory, the corridor physically severed East Prussia from the main body of the German Reich to the west, leaving it as an exclave. While the arrangement allowed for free German transit across the corridor, it remained a significant source of resentment in Germany and served as a major point of geopolitical tension leading up to World War II.123