Långsjön (Skälsätra-Tutviken)

Långsjön
Gammelströmmen, the outlet of Långsjön
Coordinates	59°12′56″N 18°14′01″E / 59.21556°N 18.23361°E / 59.21556; 18.23361Coordinates: 59°12′56″N 18°14′01″E / 59.21556°N 18.23361°E / 59.21556; 18.23361
Primary inflows	Drevviken
Primary outflows	Tyresö-Flaten
Basin countries	Sweden
Surface area	0.338 km³[1]
Max. depth	6-7 m
Surface elevation	19.0 m[1]
Settlements	Haninge, Tyresö
References	[1][2]

Långsjön (Swedish for "Long Lake") is a lake in the Tyresån Lake System located on the border between Haninge and Tyresö Municipalities in Stockholm County, Sweden.

Flowing west to east, the lake receives water from Lake Drevviken and empties into Tyresö-Flaten, and separates two residential areas — Skälsätra north of it and Tutviken south of it.

It is a shallow lake with step shores surrounded by flat rock terrain. Its water used to be unsuitable for bathing due to severe bacteria levels, but the situation has improved lately and bacteria levels in the lake are now in pair with the rest of the lake system, most likely due to decreased surface runoff caused by warmer winters. Levels of phosphorus and nitrogen are very high. The buffering capacity is very good.^[2]

Few species are contained in the lake,^[1] the aquatic vegetation of which is limited to some Reed.^[2]

Notes

References

• "Vattenväxter i sjöarna på Södertörn och i angränsande områden samt uppbyggnad av en sjödatabas" (PDF) (in Swedish). Södertörnsekologerna. pp. Appendix 7, p 2. Retrieved 2008-02-23. 
• "Tyresåns sjösystem" (in Swedish). Tyresö Municipality. Retrieved 2008-03-02.