| Lygnern | |
| Pushpin Map: | Sweden Västra Götaland # Sweden |
| Pushpin Map Alt: | Location of lake |
| Location: | Halland County, Västra Götaland County, Sweden |
| Coords: | 57.4767°N 12.3394°W |
| Outflow: | Rolfsån |
| Basin Countries: | Sweden |
| Length: | 20km (10miles) |
| Width: | 2.5km (01.6miles) |
| Area: | 33km2 |
| Max-Depth: | 50m (160feet) |
| Elevation: | 15m (49feet) |
| Cities: | Fjärås kyrkby, Sätila |
| Reference: | [1] [2] |
Lygnern (in Swedish pronounced as /ˈlʏ̂ŋːnɛɳ/)[3] is a lake in the municipalities of Kungsbacka and Mark, western Sweden. With an area of 33 km², it is the largest lake in Halland County. Its main outflow is Rolfsån, which in turn empties out into the Kungsbacka Fjord.
The lake serves as a source of drinking water for Kungsbacka. In 2006, it was nominated as the cleanest lake in Sweden, as 98% of the surveyed residents of the municipality were satisfied with the water quality.[4]
Ten fish species have been found in the lake, which is particularly rich in pike, trout and European perch.[1]