thumb|Map of the waterways of south-east Berlin, with the Seddinsee centre-right The Seddinsee is a lake in the south-eastern outskirts of Berlin, the capital city of Germany. It is aligned south-west to north-east, with its south-western end adjacent to the Berlin suburb of Schmöckwitz. Here, the Seddinsee meets the Zeuthener See and Langer See, two lakes that form part of the course of the River Dahme.
thumb|Map of the waterways of south-east Berlin, with the Seddinsee centre-right The Seddinsee is a lake in the south-eastern outskirts of Berlin, the capital city of Germany. It is aligned south-west to north-east, with its south-western end adjacent to the Berlin suburb of Schmöckwitz. Here, the Seddinsee meets the Zeuthener See and Langer See, two lakes that form part of the course of the River Dahme.
The Seddinsee is navigable. It has a length of about and a width between . Several little islands are in the lake. Besides its natural connection to the River Dahme, the Oder-Spree Canal enters the lake on its eastern shore, whilst the Gosen Canal links the lake's northern end to the Dämeritzsee. Besides considerable sightseeing and leisure traffic, the lake links several commercial navigation routes, including the route from Berlin to Poland via the River Dahme and the Oder-Spree Canal.
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