Langsee (Danish: Langsøen) is a lake in Angeln, Kreis Schleswig-Flensburg, Schleswig-Holstein, Germany. At an elevation of 16.35 m, its surface area is 151.38 ha.

Langsee
Langsø(en)
Langsee, Süderfahrenstedter side
Langsee is located in Schleswig-Holstein
Langsee
Langsee
LocationKreis Schleswig-Flensburg, Schleswig-Holstein
Coordinates54°34′33″N 9°33′55.9″E / 54.57583°N 9.565528°E / 54.57583; 9.565528
Basin countriesGermany
Surface area151.38 ha (374.1 acres)
Max. depth13.30 m (43.6 ft)
Surface elevation16.35 m (53.6 ft)