| Lake Sempach Sempachersee |
|
|---|---|
| Location | Canton of Lucerne |
| Coordinates | 47°8.6667′N 8°9.1′E / 47.1444450°N 8.1517°ECoordinates: 47°8.6667′N 8°9.1′E / 47.1444450°N 8.1517°E |
| Primary inflows | Gross Aa, Chli Aa (Sempachersee), Meierhofbach, Wilibach, Dorfbach (Sempachersee), Brandbach, Röllbach (Sempachersee), Lipperütibach, and some unnamed |
| Primary outflows | Suhre |
| Basin countries | Switzerland |
| Surface area | 14.5 km2 (5.6 sq mi) |
| Average depth | 44 m (144 ft) |
| Max. depth | 87 m (285 ft) |
| Water volume | 0.66 km3 (540,000 acre·ft) |
| Residence time | 16.9 years |
| Surface elevation | 503.77 m (1,652.8 ft) |
| Islands | Gamma Insel |
| Settlements | Sursee, Sempach |
Lake Sempach (German: Sempachersee) is a lake in the canton of Lucerne, Switzerland. Its area is about 14.5 km² and its maximum depth is 87 m.
A 50 metre-large island named Gamma Insel is located east of Sursee.