Svartån (Sommen-Roxen)

 
Svartån is an island that extends from Ormaryd in northern Småland to the outlet in Lake Roxen in Östergötland. Svartån runs through the lake Sommen and continues through Boxholm, Strålsnäs, Mjölby and past Sya, after which it runs out on the eastern street plain and finally opens into Roxen.