"Law on the Reconstruction of the Reich" of 30 January 1934, which replaced the German federal system with a unitary state. After being controlled briefly by the US following the end of the Second World War, from July 1945 the state of Thuringia came under the Soviet occupation zone and was expanded to include parts of Prussian Saxony, such as the areas around Erfurt, Mühlhausen, and Nordhausen. Erfurt became the new capital of Thuringia. Ostheim, an exclave of Landkreis Eisenach, was ceded to Bavaria. In 1952, the German Democratic Republic dissolved its states, and created districts () instead. The three districts that shared the former territory of Thuringia were Erfurt, Gera and Suhl. Altenburg Kreis was part of Leipzig Bezirk. The present State of Thuringia was recreated with slightly altered borders during German reunification in 1990. Geography Topography From the northwest going clockwise; Thuringia borders on the German states of Lower Saxony, Saxony-Anhalt, Saxony, Bavaria and Hesse. The landscapes of Thuringia are quite diverse. The far north is occupied by the Harz mountains, followed by the Goldene Aue, a fertile floodplain around Nordhausen with the Helme as most important river. The north-west includes the Eichsfeld, a hilly and sometimes forested region, where the Leine river emanates. The central and northern part of Thuringia is defined by the wide Thuringian Basin, a very fertile and flat area around the Unstrut river and completely surrounded by the following hill chains (clockwise from the north-west): Dün, Hainleite, Windleite, Kyffhäuser, Hohe Schrecke, Schmücke, Finne, Ettersberg, Steigerwald, Thuringian Forest, Hörselberge and Hainich. Within the Basin the smaller hill chains Fahner Höhe and Heilinger Höhen. South of the Thuringian Basin is the state's largest mountain range, marked by the Thuringian Forest in the north-west, the Thuringian Highland in the middle and the Franconian Forest in the south-east. Most of this range is forested and the Großer Beerberg (983 m) is Thuringia's highest mountain. To the south-west, the Forest is followed up by Werra river valley, dividing it from the Rhön Mountains in the west and the Grabfeld plain in the south. Eastern Thuringia, commonly described as the area east of Saale and Loquitz valley, is marked by a hilly landscape, rising slowly from the flat north to the mountainous south. The Saale in the west and the White Elster in the east are the two big rivers running from south to north and forming densely settled