SaarLorLux
Rhineland-Palatinate is one of the 16 Bundesländer (federal states) of Germany. It has an area of 19,846 km² and about 4.048 million inhabitants. The capital is Mainz. The federal state of Rhineland-Palatinate was established on 30 August 1946.
Trier (region)
After the Second World War the French military government several times extended the Saar area before forming the Saar Protectorate, also including additional 109 municipalities belonging until July 1946 to the Trier Region and some to the Koblenz Region. Koblenz Region's former areas make up part of today's St. Wendel district in the Saarland. In December 1946, when a new customs boundary dissected the Saar Protectorate (later becoming the Saarland) from the area under the Allied Control Council over Allied-occupied Germany, the Trier Region with its then remaining territory had become one of the then five regions forming the new state of Rhineland-Palatinate, founded in August 1946. Later, the French occupation government again redeployed some municipalities – some returned to Allied-occupied Germany, some newly annexed to the protectorate – between the Saar area and the new state of Rhineland-Palatinate in 1947 and 1949, before the border was finally fixed.