 These parts of the Marienwerder Region were officially incorporated into the Province of East Prussia in 1922, and renamed from Marienwerder Region to "Region of West Prussia".This smaller region consisted of the rural districts of , , Marienwerder, Rosenberg in West Prussia, Stuhm, and the city of Elbing (Elbląg); the districts of Elbing and Marienburg and the city of Elbing had previously been part of the Danzig Region.The districts of Deutsch-Krone, Flatow, and Schlochau became part of the new Prussian Frontier March of Posen-West Prussia.