Illsee is a natural lake used as a reservoir above Sierre, in the Valais, Switzerland. Its surface area is 0.21 km2 (0.081 sq mi).
| Illsee | |
|---|---|
 | |
  Illsee  Illsee  Illsee | |
| Location | Sierre, Valais |
| Coordinates | 46°15′27″N 7°37′57″E / 46.25750°N 7.63250°E |
| Type | natural lake, reservoir |
| Primary outflows | Illbach |
| Catchment area | 5.9 km2 (2.3 sq mi) |
| Basin countries | Switzerland |
| Max. length | 0.2 km (0.12 mi) |
| Surface area | 0.21 km2 (0.081 sq mi) |
| Max. depth | 64 m (210 ft) |
| Water volume | 6.6 million cubic metres (5,400 acre⋅ft) |
| Surface elevation | 2,360 m (7,740 ft) |
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