Posen-West Prussia
In March and September 1938, a "Verwaltungsgliederung," or administrative reform, merged the three territorially unconnected parts of the Frontier March of Posen-West Prussia province into the respective neighbouring Prussian provinces of Brandenburg, Silesia and Pomerania — placing the bulk of former Posen-West Prussia with the districts of Deutsch Krone, Flatow, "Netzekreis", Schlochau and Schneidemühl into Pomerania. Schneidemühl remained the headquarters of the government region, reduced by the districts ceded to Brandenburg and Silesia, but enlarged by four previously Brandenburgian and Pomeranian districts and renamed as Frontier March of Posen-West Prussia Region (Regierungsbezirk Grenzmark Posen-Westpreußen) for reasons of tradition, as of 1 October 1938.