Rogen (lake)

Rogen or Rovje is a lake on the border of Sweden and Norway. The lake is mostly located in Härjedalen Municipality in Jämtland county in Sweden with a small portion crossing the Norwegian border into Røros Municipality and Engerdal Municipality. The lake is the source of Sweden's longest river, Klarälven.
On the Swedish side of the border, Rogen [Nature Reserve] is centred around the lake. In Norway, Rogen lies inside Femundsmarka [National Park] in Røros and Engerdal. The lakes Nedre Roasten and Femunden lie just to the west of Rogen.