Fillingsjön with its adjacent pond and watercourse is located in an old agricultural and forestry area in northwestern Dalsland. This part of the landscape is called a forest valley, which is characterized by coniferous forest-covered hills, large elongated lakes and a variety of smaller lakes and ponds.
Fillingsjön receives its water from the Gottarsbyälven and Holtaneälven rivers and the lake flows via the Årbolsälven into Ärtingen at the power plant dam in Årbol. Ärtingen in turn is connected to Lelången.
Fillingsjön has plenty of perch and pike and catches of perch up to 1kg and pike up to 10kg are not uncommon.
The association has built a boat ramp in the lake at Sandviken.
