Svartån originates in northern Småland just south of lake Sjunnarydssjön located between Eksjö and Nässjö, on its way north it flows through lake Hamnarydssjön, Anneberga, lake Vässledasjön, lake Flisbysjön, lake Anebysjön, Aneby, lake Ralången, lake Säbysjön, Tranås, lake Sommen, lake Andersbosjön, Boxholm, Mjölby, lake Mjölorpesjön and finally flows out into the lake Roxen.
The river have a rich population of several fish species. The river are maybe most renowm among specimen anglers for its nice population of chubb and rudd. But the river also have perch, pike, bream, burbot, roach, crucian carp, eel, tench and trout. In connection to lake Sommen there are population of upstream and downstream spawning trout.
(c) Cinclus C 2013