Lake Constance, or usually from German untranslated Lake Constance, sometimes also Lake Constance after the lakeside city of the same name, is a lake in the border area of Austria, Germany and Switzerland – it concerns the Austrian state of Vorarlberg, the German states of Baden-Württemberg and Bavaria and the Swiss cantons of St. Gallen, Thurgau and Schaffhausen

The lake consists of the Obersee (473 km²) and the Untersee (63 km²), with a four km-long connecting channel. It is primarily fed by the Rhine, the Alpine Rhine, which flows into the lake in the east and leaves it in the west at the western end of the Untersee. There is no border through most of the lake, the Obersee, as politically, it is a condominium with shared sovereignty.


Lake Constance (Baden-Wurttemberg)

Lake Constance


River basin countries

Germany (Baden-Württemberg, Bayern)

Austria (Vorarlberg)


Switzerland (St. Gallen , Thurgau, Schaffhausen)




47° 38′ N, 9° 22′ E

Basic data


Obersee: 473 km², Untersee: 63 km², together 536 km² (without Seerhein) km²

Type of water


Maximum length

63 (Bregenz– Bodman ) km

Maximum width

14 (Friedrichshafen – Romanshorn) km

Average depth


Maximum depth

Obersee: 254 m, Untersee: 46 m


48000 million m³


Main sources

Obersee: Alpenrhein (main river), Alter Rhein, Goldach, Steinach, Stockacher Aach, Seefelder Aach, Rotach, Schussen, Argen, Leiblach, Bregenzer Ach, Dornbirner Ach

Untersee: Seerhein, Radolfzeller Aach

Main exits

Obersee: Seerhein

Untersee: Hochrhein


13, including Mainau, Reichenau, Lindau, Dominikanerinsel, Werd, and six uninhabited islands


Obersee: Bregenz, Rorschach, Arbon, Romanshorn, Kreuzlingen, Konstanz, Überlingen, Meersburg, Friedrichshafen, Lindau.

Untersee: Steckborn, Stein am Rhein, Radolfzell am Bodensee.


Only in very severe winters does Lake Constance freeze over. Locally this is called a ‘Seegefrörne’. In some years, the frost is so powerful that large crowds can safely enter Lake Constance.

 When this occurs, it has been a tradition since 1573 that a wooden bust of the evangelist John is exchanged in procession over the ice between the hierarchy of Hagnau in Germany and the monastery of Münsterlingen in Switzerland. This ice procession last took place on February 13, 1963. 

The bust has been in Münsterlingen ever since.

From 1899, blimps were built in a floating construction hall on the lake. A floating hall was vital because it had to be possible to point the hall towards the wind. Later the Dornier aircraft factory was established on Lake Constance. 

This location initially made seaplane production easy. Since 1990, the German government has set strict requirements for buildings along Lake Constance. For example, the aircraft factory could only expand if the new buildings were not seen from the water. This is how the German government wants to preserve the scenic beauty of Lake Constance.

Downstream on the Rhine, one enters Stein am Rhein and then Schaffhausen, known for its waterfall, the Rheinfall.


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