Altevatnet

Altevatnet or Álddesjávri is Norway’s 11th largest lake. The 79.71-square-kilometre lake lies in the Bardu Municipality in Troms county, Norway. The lake is the largest lake in the county. It is approximately 38 kilometres long and about 2.5 kilometres wide. The lake is regulated by a dam on the northwestern end of the lake. The surface lies 489 metres above sea level and reaches a maximum depth of 99 metres below the surface of the lake.
The lake lies about 10 kilometres from Sweden and it is located right between the two national parks: Øvre Dividal National Park and Rohkunborri National Park. The water discharges to the north into the Barduelva river, which empties into Målselva river, which in turn empties into the Malangen fjord.

Wikipedia