Långsjön (Skälsätra-Tutviken)

Infobox_lake
lake_name = Långsjön
image_lake = Gammelströmmen, Tyresö, 2007-06-25, outlet of Långsjön, Skälsätra-Tutviken.jpeg
caption_lake = Gammelströmmen, the outlet of Långsjön
image_bathymetry =
caption_bathymetry =
coords = coord|59|12|56|N|18|14|01|E|region:SE_type:waterbody_scale:10000|display=inline,title
type =
inflow = Drevviken
outflow = Tyresö-Flaten
catchment =
basin_countries = Sweden
length =
width =
area = 0.338 km³Södertörnsekologerna]
depth =
max-depth = 6-7 m
volume =
residence_time =
shore =
elevation = 19.0 m
islands =
cities = Haninge, Tyresö
reference = Tyresö Municipality, "Tyresåns sjösystem"]

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

Few species are contained in the lake, the aquatic vegetation of which is limited to some Reed.

Notes

References

* cite web
url = http://www.sodertornsekologerna.org/vattenvaxt0330_20031210_text_tab7_tab8.pdf
title = Vattenväxter i sjöarna på Södertörn och i angränsande områden samt uppbyggnad av en sjödatabas
publisher = Södertörnekologerna | pages = Appendix 7, p 2
accessdate = 2008-02-23 | language = Swedish
* cite web
url = http://www.tyreso.se/templates/Page____2144.aspx#Fatburen3
title = Tyresåns sjösystem
publisher = Tyresö Municipality
accessdate = 2008-03-02 | language = Swedish