Obersee
View at dusk of the Winterstaude on Lake Constance's Obersee
Obersee Show map of Canton of St. Gallen Obersee Show map of Switzerland Obersee Show map of Baden-Württemberg Obersee Show map of Germany Obersee Show map of Austria Obersee Show map of Alps
Location	Tripoint of Germany, Austria and Switzerland
Coordinates	47°37′N 9°26′E / 47.61°N 09.44°E / 47.61; 09.44
Primary inflows	Alpine Rhine, Bregenzer Ach, Argen, Alter Rhein (Fußacher Durchstich), Schussen, Dornbirner Ach, Seefelder Aach, Rotach, Stockacher Aach and smaller streams
Primary outflows	Seerhein
Max. length	63 kilometres (39 mi) [1]
Max. width	14 kilometres (8.7 mi) [1]
Surface area	472 square kilometres (182 sq mi) [2]
Average depth	101 metres (331 ft) [2]
Max. depth	251 metres (823 ft) [2]
Water volume	47.6 cubic kilometres (11.4 cu mi) [2]
Shore length1	186 kilometres (116 mi) [2]
Surface elevation	395.33 metres (1,297.0 ft)
Islands	Lindau, Mainau
Settlements	Überlingen, Meersburg, Friedrichshafen, Lindau, Bregenz, Rorschach, Konstanz
1 Shore length is not a well-defined measure.

The Obersee ( German for "Upper Lake"), also known as Upper Lake Constance, is the much larger of the two parts of Lake Constance, the other part being the Untersee ("Lower Lake").

Geography

The Obersee has an area of 473 km² in size and extends for 63 km between Bregenz and Bodman-Ludwigshafen. Its maximum width is 14 km. It drains through the Seerhein in Constance into the Untersee. Its main inflow is the Alpine Rhine.

The distinctive, northwestern arm and 21 square kilometres (8.1 sq mi)-large Lake Überlingen ( Standard German of Germany: Überlinger See) is part of the Upper Lake Constance, as well as the Bay of Bregenz, and the Constance Hopper.

The countries that border the lake are Switzerland, with its cantons of Thurgau and St. Gallen, Austria, with its federal state Vorarlberg, and Germany, with its federal states of Baden-Württemberg and Bavaria. The border between the riparian states on the south-eastern main part of the Obersee have never been jointly agreed (see Lake Constance); only the smaller northwestern water of Lake Überlingen is completely German territory.

Origin of the name

The Romans called it Lacus Venetus, Lacus Brigantinus and Lacus Constantinus. In the Middle Ages the dominant term was Lacus Bodamicus, or in German Bodensee.^{[ citation needed]} Gradually, this name began to include the Lower Lake (Lacus Acronius), so the term "Upper Lake" was introduced for the larger lake.^{[ dubious – discuss]}

See also

• Untersee (Lake Constance)

References

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External links

• International Bodensee Conference
• Bodensee-data of the International Lake Constance Conference