Lake Zürich (
Swiss German/
Alemannic:
Zürisee;
German:
Zürichsee) is a
lake in
Switzerland, extending southeast of the city of
Zürich. Depending on the context, Lake Zürich or
Zürichsee can be used to describe the lake as a whole, or just that part of the lake downstream of the
Seedamm at
Rapperswil, whilst the part upstream of Rapperswil may be called the
Obersee or Upper Lake.