Corridor Treaty

© HdbG The corridor (white) between East Prussia and the German Reich

On 21 April 1921, the “Corridor Treaty” is concluded between the German Reich, Poland, and the Free City of Danzig. The Versailles Peace Treaty had already prescribed the size and location of the „Polish Corridor“. Accordingly, the 19 to 56 mile-wide region, with a surface of nearly 6,178 square miles and 330,000 inhabitants, encompasses the largest portion of the former Prussian province of West Prussia between the underflow of the Vistula in the east and Pomerania in the west. Poland is assured an „undisturbed access to the Baltic Sea“. In return the Polish government must grant „to the German Reich unimpeded train, ship, postal, telephone, and telegraph connections between the Free City of Danzig and East Prussia“.