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Lake Constance
Bodensee satellit.jpg
Satellite image
Karte Bodensee.png
Location Germany, Switzerland, Austria
Coordinates 47°35′N 9°28′E / 47.583°N 9.467°E / 47.583; 9.467
Type glacial lake
Native name Bodensee Error {{native name checker}}: parameter value is malformed (help)
Part of Rhine
Primary inflows Alpine Rhine
Primary outflows High Rhine
Catchment area 11,500 km2 (4,400 sq mi)
Basin countries Germany, Switzerland, Austria
Max. length 63 km (39 mi)
Max. width 14 km (8.7 mi)
Surface area 536 km2 (207 sq mi)
Average depth 90 m (300 ft)
Max. depth 251 m (823 ft)
Water volume 48 km3 (12 cu mi; 39,000,000 acre⋅ft)
Residence time 4.3 years
Shore length1 273 km (170 mi)
Surface elevation 395 m (1,296 ft)
Frozen 1795, 1830, 1880 (partial), 1963
  • Mainau
  • Reichenau
  • Lindau
  • and others
  • Obersee
    • Überlinger See
  • Seerhein
  • Untersee
    • Gnadensee
    • Zeller See
    • Rheinsee
Settlements see list
1 Shore length is not a well-defined measure.

Lake Constace or Lake of Constance (German: Bodensee) is a large Lake on the river Rhine. It is on the border between Germany and Switzerland and Austria. It is the third largest lake in Central Europe after Lake Balaton and Lake Geneva. It is made of two smaller lakes (called Obersee and Untersee (Upper and lower lake) respectively). These are joined by a small part of river in Constance. The lake covers about 564 km2 (218 sq mi) of total area.

There are three big islands in the lake. The islands Lindau and Mainau are in the Obersee. Reichenau is in the Untersee. The Obersee is about 63 km (39 mi) long, from Bregenz to Ludwigshafen. It is about 14 km (9 mi) wide at its widest point between Romanshorn and Friedrichshafen. The deepest point is 254 m (833 ft) deep, between Fischbach and Uttwil (just off Constance).

The lake forms the border between Austria, Germany and Switzerland. On much of its length, this border has not been defined. Switzerland thinks the border runs through the middle of the lake. Austria thinks the lake is a condominium of all the countries. A condominium is a space that is governed by all countries taking part in it. Germany has no clear view.

Other legal issues, like navigation and fishing are governed by separate treaties. About 62% of the lake's shoreline belongs to Germany, about 33% to Switzerland, and the remaining 11% to Austria.

In 1963, the whole lake froze. This has not happened since then.

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