Province of German Bohemia

The Province of German Bohemia (German: Provinz Deutschböhmen [ˈdɔʏtʃbøːmən] ; Czech: Německé Čechy) was an unrecognised province in Bohemia (in the present-day Czech Republic), self-proclaimed by a group of German-speaking deputies of the Imperial Council of Austria on 29 October 1918 at the end of the First World War. With the proclamation, the German-speaking deputies from northern and western parts of Bohemia attempted to secede from the First Czechoslovak Republic (which had declared independence from Austria-Hungary on 18 October 1918), and sought to attach themselves to the unrecognised Republic of German-Austria.

Source: Wikipedia — Province of German Bohemia (CC BY-SA 4.0)