Kolsnaren and Viren are lakes in Sodermanland, Katrineholm and Vingåker municipalities included in Nyköping water. Kolsnaren is 12 km² and the deepest 12 m and drains through Viren to Nyköpingsån
The lakes contain perch, pike, perch, eel, burbot and stocked rainbow trout. Walleye and rainbow trout has been implanted running of the association in recent years.
Interest in sport fishing in the lakes has increased and we are selling more and more fishing licenses. It has enabled us dried with quite a few fish conservation measures. Stocking of pike has occurred almost every year, on some occasions, we have also sat in rainbow trout.