The catchment area is mostly composed of forest and open terrain part of the Grimsta nature reserve, with several minor wetlands.

300 metres downstream is a historical mill administrated by a society devoted to local culture and history (Vällingby hembygdsförening) with limited means to regulate the water level.

West of the lake is a grass-grown peak composed of excavated material from the construction of the suburbs Vällingby and Hässelby.

[4] Local storm water pipes, occasionally fouled with oil of unknown origin, produces most of the affluent, with remaining contributions coming from local roads and run-off from residential areas, the latter bringing mostly nutrients to the lake with minor contributions of zinc and copper (from roofs).

Along the shores are Alisma, slender tufted-sedge, cyperus-like sedge, reed sweet-grass, yellow iris, purple loosestrife, Phragmites, Rorippa amphibia, and many others.