Rhineland-Palatinate
The state of Rhineland-Palatinate was founded shortly after the Second World War on 30 August 1946. It was formed mainly from the southern part of the Prussian Rhine Province (the "Regierungsbezirke" of Koblenz and Trier), from Rhenish Hesse, from the western part of Nassau and the Bavarian Rhenish Palatinate minus the county of Saarpfalz. The Joint German-Luxembourg Sovereign Region ("Gemeinschaftliches deutsch-luxemburgisches Hoheitsgebiet") is the only unincorporated area of the state of Rhineland-Palatinate. This condominium is formed by the rivers Moselle, Sauer, and Our, where they run along the border between Luxembourg and Rhineland-Palatinate or the Saarland.
Gollenberg, Rhineland-Palatinate
In 1815, the Congress of Vienna assigned the "Birkenfelder Land" to the Grand Duke of Oldenburg, who took charge of his new holding on 16 April 1817, naming it the Principality of Birkenfeld. On 1 April 1937, under the Greater Hamburg Act, the old principality was absorbed into Prussia, which was still a distinct entity during the Third Reich. Since 1946, it has been part of the then newly founded state of Rhineland-Palatinate.