Längsee is a lake of Carinthia, Austria. It is the name affix of the town Sankt Georgen am Längsee.

Längsee
South view of Längsee
Location of Längsee in Austria.
Location of Längsee in Austria.
Längsee
LocationCarinthia, Austria
Coordinates46°47′22″N 14°25′27″E / 46.78944°N 14.42417°E / 46.78944; 14.42417
Typelake