Description
Lake Sommen is quite deep and most of the lake is ice-free all-winter. During this period large amounts of veliki žagar, zvonec and čopasti ponirek winter in Sommen. Sometimes in the hundreds. Among these čopasta črnica, labod grbec, labod pevec, liska, and sivi galeb can often be found. The lake is also home to quite a few rarer wintering birds like polarni slapnik, srednji žagar, planinski orel, crna raca, beloliska, vodomec, rdečegrli slapnik and rečni galeb.
During the spring migration marine ducks can be found in the lake. At the same time rdečegrli slapnik, and polarni slapnik, arrive at the lake. polarni slapnik breeds in the lake while rdečegrli slapnik feeds in the lake and breeds in small neighbouring lakes. The rare rumenokljuni slapnik has been seen. Sommen archipelago hosts large colonies of navadna čigra, sivi galeb, rečni galeb, srebrni galeb, siva čaplja and veliki kormoran. Among these some rare birds like rjavi galeb, and polarna čigra can be seen.
The large decidous forests around sommen especially on Torpön host plenty of quite rare birds like: mali muhar, mali detel, Krekovt, and mala uharica. Around Sommen there is also old conifer forests around which support large populations of woodpeckers. vijeglavka, zelena žolna, črna žolna, mali detel, triprsti detel (very rare), veliki detel and belohrbti detel (extinct in the area) have all been recorded. Other otherwise rare forrest birds found here are: gozdni jereb divji petelin, ruševec (Rocks mosse), and Krekovt.
During the autumn birds can be seen migrating through the lake. Most common are the doves, finches, terns, and waders. At Rocks mosse ruševec and divji petelin breed. At Visskvarn there are rapids where povodni kos, and siva pastirica can be seen.
Details
Access
The area is quite vast, and has got many places to get a good view of the lake. The area is quite mountanous and a walk can be straining. Click on a P in the map to get directions to that point.

