How did the Treaty of Versailles separate East Prussia from the rest of Germany?

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Historical map showing the unification of Germany by Prussia in the late 19th century. The map highlights in green the Kingdom of Prussia as of 1866, and in yellow the additional territories that formed the German Empire by 1871-1918, encompassing most of north-central Europe. Neighboring countries such as France, Belgium, the Netherlands, Denmark, Sweden, Russia, Austria-Hungary, and Switzerland are labeled, with major regions and states within the empire clearly marked. — Prussia The unification of Germany by Prussia, which brought most of north-central Europe into one kingdom.

Under the terms of the Treaty of Versailles, Germany was required to cede significant portions of its territory to the newly reconstituted Poland, including most of West Prussia and the province of Posen (Poznań).1

This transfer of land created the Polish Corridor, a strip of territory that provided Poland with access to the Baltic Sea. By establishing this corridor, the treaty physically separated the province of East Prussia from the main body of Germany. Additionally, the city of Danzig was established as a free city, further altering the regional geography and isolating East Prussia from the rest of the German state.2134