| Obersee | |
|---|---|
&sq=Qlik&lang=&file=File:Arosa,_Switzerland_-_Lake_(1).jpg) | |
&sq=Qlik&lang=&file=File:Reliefkarte_Graub%C3%BCnden.png)  Obersee &sq=Qlik&lang=&file=File:Switzerland_relief_location_map.jpg) Obersee &sq=Qlik&lang=&file=File:Italy_relief_location_map.jpg) Obersee &sq=Qlik&lang=&file=File:Alps_location_map.png) Obersee | |
| Location | Arosa, Grisons |
| Coordinates | 46°47′04″N 9°40′53″E / 46.78444°N 9.68139°E |
| Type | oligotrophic, dimictic |
| Basin countries | Switzerland |
| Max. length | 390 m (1,280 ft) |
| Max. width | 250 m (820 ft) |
| Surface area | 7.1 ha (18 acres) |
| Average depth | 7.3 m (24 ft) |
| Max. depth | 13 m (43 ft) |
| Water volume | 0.5 million cubic metres (410 acre⋅ft) |
| Surface elevation | 1,734 m (5,689 ft) |
| Frozen | 5-6 months |
 | |
Obersee ("upper lake") or Oberer Arosasee is the lake in the center of Arosa, a resort in the Grisons, Switzerland. The lake has a surface area of 7.1 ha (18 acres) at an elevation of 1734 m. Arosa's lower lake (Untersee) is at 1691 m.