1) International river of Europe 
The Paatsjoki River (Paatsjoki, Paaččjokk, Báhčaveaijohka, Pasvikelva, Pasvik älv, Паз or Патсойоки) is a river that flows through Finland, Norway, and Russia. Since 1826, the river has marked parts of the Norway–Russia border, except 1920-1944 when it was along the Finland–Norway border. The river is the outlet from the large...