A Picture of a canal in Saimaa Saimaa, or Saimen in Swedish, is a lake in southeastern Finland. ... Lake Päijänne is the third biggest lake in Finland (1038 km2 water area). ... Lake Inari (Finnish: Inarijärvi, Northern Sami: Anárjávri, Swedish: Enare träsk) is the second largest lake in Finland, and the sixth largest lake in Europe. ... The Pielinen is the fourth-largest lake of Finland. ... Oulujärvi (pronounced ÅlÅ-yÇrvÄ) is a the fifth largest lake in Finland, at 88,709 km². It is located in the north-central region of the country and is drained by the Oulu River, which flows northwestward from the lake to the Gulf of Bothnia. ...