Ärrsjön is located south of Fröskog / Fengersfors, 2 mil SW of Amal, and covers 550 ha with a maximum depth of 27 m. The lake is connected to Dalsland Canal through the stream and snackes locks in the south. Implantations have been of Gullspång and West strainer Trout. Restoration was done in 2015 by the effect (the build up of migration). In other good stocks of pike and perch. Possibility of launching the Fröskogs marina on the north end of the lake.