Jølstravatnet or Jølstravatn is a lake in the municipality of Jølster in Sogn og Fjordane county, Norway. The lake empties its water into the 20-kilometre (12 mi) long Jølstra river which then flows into the Førdefjorden. The impressive eastern arm of Jølstravatn is called Kjøsnesfjorden, although it is not a true fjord that is part of the sea.