Numedalslågen
| Numedalslågen Lågen | |
|---|---|
| Numedalslågen at Godfarfossen | |
| Location | |
| Country | Norway | 
| County | Vestland, Buskerud, Vestfold | 
| Municipalities | Eidfjord, Nore og Uvdal, Hol, Rollag, Flesberg, Kongsberg, Larvik | 
| Physical characteristics | |
| Source | Hardangervidda plateau | 
| • location | Eidfjord, Vestland | 
| • coordinates | 60°14′04″N 7°17′32″E / 60.234570°N 7.29217529°E | 
| • elevation | 1,405 metres (4,610 ft) | 
| Mouth | Larviksfjorden | 
|  • location | Larvik, Vestfold | 
|  • coordinates | 59°02′16″N 10°03′18″E / 59.0376403°N 10.055065°E | 
|  • elevation | 0 metres (0 ft) | 
| Length | 356 km (221 mi) | 
| Basin size | 5,548 km2 (2,142 sq mi) | 
| Discharge | |
| • average | 111 m3/s (3,900 cu ft/s) | 
| Basin features | |
| Landmarks | Numedal valley | 
Numedalslågen is a river in Norway. It is considered to be the second longest river in Southern Norway. It is located in the Numedal valley which runs through the counties of Vestfold, Buskerud and Vestland. At 356 kilometres (221 mi) long, it is of the longest rivers in Norway.