The Hegau is an extinct volcanic landscape in southern

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

extending around the industrial city of

Singen Singen (Low Alemannic German, Low Alemannic: ''Singe'') is an industrial city in the very south of Baden-Württemberg in southern Germany and just north of the German-Swiss border. Location Singen is an industrial city situated in the very south ...

(Hohentwiel), between

Lake Constance Lake Constance (german: Bodensee, ) refers to three Body of water, bodies of water on the Rhine at the northern foot of the Alps: Upper Lake Constance (''Obersee''), Lower Lake Constance (''Untersee''), and a connecting stretch of the Rhine, ca ...

in the east, the

Rhine ), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , so ...

River in the south, the

Danube The Danube ( ; ) is a river that was once a long-standing frontier of the Roman Empire and today connects 10 European countries, running through their territories or being a border. Originating in Germany, the Danube flows southeast for , pa ...

River in the north and the

Randen Randen may refer to: * Randen (mountain range), in Switzerland and Germany * Randen, a tram line of the Keifuku Electric Railroad in Japan See also

* Randens {{Geodis ...

—as the southwestern mountains of the

Swabian Jura The Swabian Jura (german: Schwäbische Alb , more rarely ), sometimes also named Swabian Alps in English, is a mountain range in Baden-Württemberg, Germany, extending from southwest to northeast and in width. It is named after the region of ...

are called—in the west. It was first mentioned in A.D. 787 in the Latinised form ''in pago Egauinsse''.Albert Krieger:
Topographisches Wörterbuch des Großherzogtums Baden, Vol. 1, p. 882 (1904)
' Hohentwiel sideview

The most famous sight of the Hegau is the

Hohentwiel Hohentwiel is an extinct volcano in the Hegau region of Baden-Württemberg in southern Germany The mountain is west of the city of Singen and 20 miles (30 km) from Lake Constance. Hohentwiel began forming, along with the chain of vol ...

, a volcanic stub. On top of the mountain lies Hohentwiel fortress. The Hohentwiel is the southernmost of a row of volcanic stubs in the Hegau, including the Hohenkrähen, the Hohenstoffeln, and the Hohenhewen.

References

Regions of Baden-Württemberg Natural regions of the Alpine Foreland {{Regional-geology-stub