Two bridges cross the lake; several major roads pass through the catchment area, as do the above ground tracks of the metro and suburban railway.

[3] The primary catchment area is relatively small and composed of three ditches — Magelungsdiket, Kräppladiket, and Djupån — together contributing about 3 million cubic metres annually.

The deepest south-eastern part of the lake suffers from oxygen deficiency and hydrogen sulphide which causes high levels of phosphorus.

[3] In the south-eastern part of the lake, phytoplankton are dominated by various species of cyanobacteria, some of which are nitrogen-binding and potentially poisonous, and exceptionally other nutrient-demanding algae and dinoflagellates.

[4] A number of birds breed along the north-western shore, including Eurasian coot, common moorhen, mallard, and great crested grebe.

Lesser spotted woodpecker have been reported in the surrounding forest and the lake is the home of a rare pair of marsh harriers.