Vefsna (Norwegian), Vaapstenjeanoe (Southern Sami)[1], or Vapstälven (Swedish)[2] is the largest river in Nordland county, Norway.

Its headwaters lie in the mountains of Børgefjell National Park at the lake Simskardvatnet.

The river flows north, not far from the Swedish border, and some of the minor tributaries come from Sweden.

At the town of Mosjøen, the river discharges into the Vefsnfjorden.

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