The 746-acres Lake Flen has a maximum depth of 16 meters. The main reach of River Sällevadsån passes through the lake before it enters River Emån further downstream. Lake Flen has large populations of perch, pike and roach. In addition to that, the lake offers good fishing for pike-perch. The lake is easily accessible because of two boat ramps and boat-hiring possibilities.
Drags Udde nature reserve with its esker is located in the south-eastern part of the lake. Lake Flen is also a bird protection area. Fish speciesPerch
, crucian carp