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Southern Sami: Vaapstenjeanoe
Swedish: Vapstälven[1]
The Laksforsen waterfall
Country Norway
County Nordland
District Helgeland
Municipalities Hattfjelldal, Vefsn, Grane
 - left Svenningelva
City Mosjøen
Source Simskardvatnet
 - location Hattfjelldal, Nordland, Norway
 - elevation 877 m (2,877 ft)
 - coordinates 65°16′59″N 13°48′51″E / 65.28306°N 13.81417°E / 65.28306; 13.81417
Mouth Vefsnfjord, Mosjøen
 - location Vefsn, Nordland, Norway
 - elevation 0 m (0 ft)
 - coordinates 65°50′09″N 13°11′26″E / 65.83583°N 13.19056°E / 65.83583; 13.19056Coordinates: 65°50′09″N 13°11′26″E / 65.83583°N 13.19056°E / 65.83583; 13.19056
Length 163 km (101 mi)
Basin 4,122 km2 (1,592 sq mi)

The river Vefsna (Southern Sami: Vaapstenjeanoe or Swedish: Vapstälven) is the largest river in Nordland county, Norway. It is 163 kilometres (101 mi) long and drains a watershed of 4,122 square kilometres (1,592 sq mi). Its headwaters lie in the mountains of Børgefjell National Park at the lake Simskardvatnet. The river runs through the municipalities of Hattfjelldal, Grane, and Vefsn. The southern parts of the river are sometimes called the river Susna. The river flows north, not far from the Swedish border, and some of the minor tributaries come from Sweden. At Mosjøen, the river discharges into the Vefsnfjord. The Laksforsen waterfall lies along its course.[2]

Nordlandsbåter on the Vefsna

Historically it was an important salmon fishery, but it has now been infected with the salmon parasite Gyrodactylus salaris.[3]