Trekanten 3.3

Trekanten is a small lake in southern-central Stockholm, Sweden.With a small drainage area with no major feeders, Trekanten is located in a park furnished with an artificial bathing beach and various planted-out fish species. In the early 1980s, potable water was begun to be poured into the lake while water from the bottom of the lake was pumped out, operations resulting in a significant reduction in levels of phosphorus but which failed to affect levels of nutrients and oxygen depletion in bottom layers. Levels of lead and copper are among the highest documented in any lake in Stockholm. Whilst the lake flora and fauna is roughly representative for Stockholm, the lake forms a natural link between the bays Årstaviken and Vinterviken.Catchment areaAlong the shores of the lake is a park created on a flat terrain. Leading up to Nybohov on the southern side of the lake is a fault bluff with pines and deciduous trees, including hazel. On the eastern shore is a bathe next to the Liljeholmen metro station, a bus terminal, the light rail Tvärbanan, newly added flats, and some older buildings. Several residential areas surround the lake, including Gröndal.About 30% of the catchment area is settled land and two major traffic routes passes through the area.