Trekanten

Trekanten is a small lake in southern-central Stockholm, Sweden.

Trekanten is located in a park furnished with an artificial bathing beach and various planted-out fish species. It has a small drainage area with no major feeders. In the early 1980s, potable water was poured into the lake while water from the bottom of the lake was pumped out. These operations resulted in a significant reduction in levels of phosphorus but failed to affect levels of nutrients and oxygen depletion in the 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.