 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (March 2018) |
| Untersee | |
|---|---|
&sq=Qlik&lang=&file=File:2011-05-09_10-02-04_Switzerland_Kanton_Thurgau_Rickenbach.jpg) View from an aeroplane above Rickenbach (CH) of the Untersee and the island of Reichenau (D) with Lake Überlingen (D), the northwestern part of the Obersee (D/CH/A) behind. | |
&sq=Qlik&lang=&file=File:Baden-Wuerttemberg_relief_location_map.jpg)  Untersee &sq=Qlik&lang=&file=File:Relief_Map_of_Germany.svg) Untersee &sq=Qlik&lang=&file=File:Reliefkarte_Thurgau.png) Untersee &sq=Qlik&lang=&file=File:Switzerland_relief_location_map.jpg) Untersee &sq=Qlik&lang=&file=File:Alps_location_map.png) Untersee | |
| Location | – Baden-Württemberg (Germany) – Cantons of Thurgau and Schaffhausen (Switzerland) |
| Coordinates | 47°41′42″N 9°1′28″E / 47.69500°N 9.02444°E |
| Primary inflows | Seerhein, Radolfzeller Aach and smaller streams |
| Primary outflows | High Rhine |
| Surface area | 62 square kilometres (24 sq mi)[1] |
| Average depth | 13 metres (43 ft)[1] |
| Max. depth | 45 metres (148 ft)[2] |
| Water volume | 0.8 cubic kilometres (0.19 cu mi)[1] |
| Shore length1 | 87 kilometres (54 mi)[1] |
| Surface elevation | 395.11 metres (1,296.3 ft)[1] |
| Islands | Reichenau, the Werd islands |
| Settlements | Radolfzell am Bodensee |
 | |
| 1 Shore length is not a well-defined measure. | |
The Untersee (German for Lower Lake), also known as Lower Lake Constance, is the smaller of the two lakes that together form Lake Constance. The boundary between Switzerland and Germany runs through it. The lake surrounds several islands, the largest being Reichenau Island.