Description
Lake Sommen is quite deep and most of the lake is ice-free all-winter. During this period large amounts of Χηνοπρίστης, (Ευρωπαϊκή) Βουκεφάλα and Σκουφοβουτηχτάρι winter in Sommen. Sometimes in the hundreds. Among these Μαυροκέφαλη Πάπια, (Βουβός) Κύκνος, Αγριόκυκνος, (Κοινή) Φαλαρίδα, and Θυελλόγλαρος can often be found. The lake is also home to quite a few rarer wintering birds like Λαμπροβούτι, Θαλασσοπρίστης, Χρυσαετός, (Ευρωπαϊκή) Μαυρόπαπια, Βελουδόπαπια, (Ευρωπαϊκή) Αλκυόνη, Κηλιδοβούτι and Καστανοκέφαλος Γλάρος.
During the spring migration marine ducks can be found in the lake. At the same time Κηλιδοβούτι, and Λαμπροβούτι, arrive at the lake. Λαμπροβούτι breeds in the lake while Κηλιδοβούτι feeds in the lake and breeds in small neighbouring lakes. The rare White-billed Diver has been seen. Sommen archipelago hosts large colonies of Ποταμογλάρονο, Θυελλόγλαρος, Καστανοκέφαλος Γλάρος, Ασημόγλαρος του Βορά, Σταχτοτσικνιάς and (Ευρωπαϊκός) Κορμοράνος. Among these some rare birds like Μελανόγλαρος, and Χιονογλάρονο can be seen.
The large decidous forests around sommen especially on Torpön host plenty of quite rare birds like: Νανομυγοχάφτης, Νανοδρυοκολάπτης, Καρυοθραύστης, and Νανόμπουφος. Around Sommen there is also old conifer forests around which support large populations of woodpeckers. Στραβολαίμης, Πράσινος Δρυοκολάπτης, Μαύρος Δρυοκολάπτης, Νανοδρυοκολάπτης, Τριδάχτυλος Δρυοκολάπτης (very rare), Πευκοδρυοκολάπτης and Λευκονώτης Δρυοκολάπτης (extinct in the area) have all been recorded. Other otherwise rare forrest birds found here are: Δασόκοτα Αγριόκουρκος, Λυροπετεινός (Rocks mosse), and Καρυοθραύστης.
During the autumn birds can be seen migrating through the lake. Most common are the doves, finches, terns, and waders. At Rocks mosse Λυροπετεινός and Αγριόκουρκος breed. At Visskvarn there are rapids where (Ευρωπαϊκός) Νεροκότσυφας, and Σταχτοσουσουράδα 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.

