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Numedalslågen
 
 
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Numedalslågen is a river located in southeastern Norway
Norway

Norway , officially the Kingdom of Norway, is a constitutional monarchy in Northern Europe that occupies the western portion of the Scandinavian Peninsula....
. It stretches for over 250 kilometres through the counties of Vestfold
Vestfold

is a Counties of Norway in Norway, bordering Buskerud and Telemark. The county administration is in T?nsberg.Vestfold is located west of the Oslofjord, as the name indicates....
 and Buskerud
Buskerud

is a Counties of Norway in Norway, bordering Akershus, Oslo, Oppland, Sogn og Fjordane, Hordaland, Telemark, and Vestfold. The county administration is located in Drammen....
, beginning at the Hardangervidda
Hardangervidda

The Hardangervidda is a mountain plateau in the Hardanger region of western Norway. It is the largest such plateau in Europe, with a cold year-round alpine climate and is the site of one of Norway's largest glaciers....
 plateau and meeting the ocean at Larvik
Larvik

is a List of cities in Norway and Municipalities of Norway in Vestfold Counties of Norway, Norway. The administrative centre of the municipality is the city of Larvik....
 in Vestfold
Vestfold

is a Counties of Norway in Norway, bordering Buskerud and Telemark. The county administration is in T?nsberg.Vestfold is located west of the Oslofjord, as the name indicates....
. Numedalslågen is one of Norway's longest rivers. There are a number of hydroelectric plants
Hydroelectricity

Hydroelectricity is electricity generated by hydropower, i.e., the production of power through use of the gravitational force of falling or flowing water....
 located in the higher range of Numedalslågen.

Numedalslågen is known for being a good location for salmon
Salmon

Salmon is the common name for several species of fish of the family Salmonidae. Several other fish in the family are called trout,the difference is often attributed to the migratory life of the salmon as compared to the residential behaviour of trout, this holds true for the Atlantic salmon....
 fishing, although a parasite known as Gyrodactylus salaris
Gyrodactylus salaris

Gyrodactylus salaris is a small monogenean ectoparasite which mainly lives on the skin of freshwater Atlantic salmon. It attaches to the fish by a large specialized posterior attachment organ, the which has sixteen sharp hooks located around its margin....
 has recently been found in Numedalslågen that may pose a threat to its salmon stock.






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Numedalslågen is a river located in southeastern Norway
Norway

Norway , officially the Kingdom of Norway, is a constitutional monarchy in Northern Europe that occupies the western portion of the Scandinavian Peninsula....
. It stretches for over 250 kilometres through the counties of Vestfold
Vestfold

is a Counties of Norway in Norway, bordering Buskerud and Telemark. The county administration is in T?nsberg.Vestfold is located west of the Oslofjord, as the name indicates....
 and Buskerud
Buskerud

is a Counties of Norway in Norway, bordering Akershus, Oslo, Oppland, Sogn og Fjordane, Hordaland, Telemark, and Vestfold. The county administration is located in Drammen....
, beginning at the Hardangervidda
Hardangervidda

The Hardangervidda is a mountain plateau in the Hardanger region of western Norway. It is the largest such plateau in Europe, with a cold year-round alpine climate and is the site of one of Norway's largest glaciers....
 plateau and meeting the ocean at Larvik
Larvik

is a List of cities in Norway and Municipalities of Norway in Vestfold Counties of Norway, Norway. The administrative centre of the municipality is the city of Larvik....
 in Vestfold
Vestfold

is a Counties of Norway in Norway, bordering Buskerud and Telemark. The county administration is in T?nsberg.Vestfold is located west of the Oslofjord, as the name indicates....
. Numedalslågen is one of Norway's longest rivers. There are a number of hydroelectric plants
Hydroelectricity

Hydroelectricity is electricity generated by hydropower, i.e., the production of power through use of the gravitational force of falling or flowing water....
 located in the higher range of Numedalslågen.

Numedalslågen is known for being a good location for salmon
Salmon

Salmon is the common name for several species of fish of the family Salmonidae. Several other fish in the family are called trout,the difference is often attributed to the migratory life of the salmon as compared to the residential behaviour of trout, this holds true for the Atlantic salmon....
 fishing, although a parasite known as Gyrodactylus salaris
Gyrodactylus salaris

Gyrodactylus salaris is a small monogenean ectoparasite which mainly lives on the skin of freshwater Atlantic salmon. It attaches to the fish by a large specialized posterior attachment organ, the which has sixteen sharp hooks located around its margin....
 has recently been found in Numedalslågen that may pose a threat to its salmon stock. Among the other fish species of Numedalslågen are trout
Trout

Trout are a number of species of freshwater fish belonging to the Salmoninae subfamily of the Salmonidae family. Salmon belong to some of the same genera as trout but, unlike most trout, most salmon species spend almost all their lives in salt water....
, eel
Eel

True eels are an order of fish, which consists of four suborders, 19 Family s, 110 genera and approximately 600 species. Most eels are predators....
, and pike
Esox

Esox is a genus of freshwater fish, the only living genus in the family Esocidae. The type species is E. lucius, the northern pike....
.

The rivers runs through the municipalities Larvik
Larvik

is a List of cities in Norway and Municipalities of Norway in Vestfold Counties of Norway, Norway. The administrative centre of the municipality is the city of Larvik....
, Lardal
Lardal

Lardal is a Municipalities of Norway in Vestfold Counties of Norway, Norway. The administrative centre of the municipality is the village of Svarstad....
, Kongsberg
Kongsberg

is a List of cities in Norway and Municipalities of Norway in Buskerud Counties of Norway, Norway. It is located at the southern end of the Districts of Norway of Numedal....
, Flesberg
Flesberg

Flesberg is a Municipalities of Norway in Buskerud Counties of Norway, Norway. It is part of the Districts of Norway of Numedal. The administrative centre of the municipality is the village of Lampeland....
, Rollag
Rollag

Rollag is a Municipalities of Norway in Buskerud Counties of Norway, Norway. It is part of the Districts of Norway of Numedal. The municipality of Rollag was established on 1 January 1838 ....
 and Nore og Uvdal
Nore og Uvdal

Nore og Uvdal is a Municipalities of Norway in Buskerud Counties of Norway, Norway. It is part of the Districts of Norway of Numedal. The administrative centre of the municipality is the village of R?dberg....
. These municipalities cooperate in the administration and use of resources connected to the river in various projects under the "Grønn Dal" ('Green Valley') umbrella.