The Hohentwiel is a 2251ft (686m) high extinct volcano in the Hegau region of Baden-Württemberg in southern Germany. Plate tectonics and hotspots Divergent plate boundaries At the The Hegau is a formerly volcanic landscape in southern Germany extending around the industrial city of Singen (Hohentwiel between Lake Constance in the Baden-Württemberg is one of the 16 states ( Bundesländer) of the Federal Republic of Germany. Germany, officially the Federal Republic of Germany ( ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant is a Country in Central Europe. About 20 miles (30k) from Lake Constance, it lies in the German City of Singen
The Hohentwiel was begun, along with the chain of volcanoes in the Hegau, about 7-8 million years ago, when a layer of volcanic ash and stone was laid down. Under the designation Lake Constance or Lake of Constance ( German Bodensee) one summarizes the three independent bodies of water Obersee Singen (Hohentwiel is a city in the very south of Baden-Württemberg in southern Germany. The magma consists of Phonolite. Phonolite is an evolved lava which is considered as forming in shallow Magma chambers Phonolite is an igneous, volcanic ( Extrusive) rock In the following millions years the core was opened by the glaciers from the ice age 260 meters beneath the surface. This formed the core that is now exposed, after the ensuing millions of years of erosion.
The fortress whose ruins top the Hohentwiel was begun in 914 with stone taken from the mountain itself by Burchard III, Duke of Swabia. Burchard III (c 915 &ndash 12 November 973) was the count of Thurgau and Zürichgau perhaps of Rhaetia, and then Duke of Swabia Originally, the monastery of St. Georg was contained within the fortress, but in 1005 it was moved to Stein am Rhein (now in Switzerland}, and the Swabian dukes lost control of the Hohentwiel. Stein am Rhein is a municipality in the canton of Schaffhausen in Switzerland. Switzerland (English pronunciation; Schweiz Swiss German: Schwyz or Schwiiz Suisse Svizzera Svizra officially the Swiss Confederation In the later Middle Ages the noble familes von Singen-Twiel (12. -13 cent. ), von Klingen (to 1300) and von Klingenberg (to 1521) resided here. In 1521, it passed to Duke Ulrich von Württemberg, who developed the Hohentwiel into one of the strongest fortresses of his duchy. The fortress resisted five imperial sieges in the Thirty Years' War. The Hohentwiel served in the 18-th century as a Württemberg prison. The fortress was destroyed in 1800 after peaceful handing over by the French. Today the former fortress Hohentwiel is one of the biggest castle ruins of Germany.
The modern city of Singen (Hohentwiel) nestles at the foot of the mountain. Singen (Hohentwiel is a city in the very south of Baden-Württemberg in southern Germany.
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