Alsensjön stretches between Ytterån in the east to Alsen in the west and the lake is about 20 km long and about 2 km at its widest points.
There is plenty of fish in the lake. Through various measures, we have achieved a good trout population. There is also a small population of char in the lake. Otherwise, there is grayling, whitefish, perch, pike and roach in the lake.
