Grimsta Nature Reserve extends along Lake Mälaren from Tyska botten in the south to the Hässelby strand in the north.

Råckstaträsk lake and the Mälaren island Hässelby holme are included in the reserve.

The reserve includes several boating and canoeing clubs, Kanaanbadet, Kvarnviken's mill, and the shoreline areas of Blackebergsbacken and Blackeberg Hospital.

The Stockholm Bypass is planned to go under Grimstaskogen forest near Kanaanbadet, and a non-profit organisation called Arbetsgruppen Rädda Grimstaskogen[2] is working to stop this or reduce environmental degradation.

As the plans for the Stockholm Bypass originally stood, a 6-lane motorway bridge over Lambarfjärden was supposed to dive into a tunnel just above the beach between Kanaanbadet and Maltesholmsbadet, but this has been stopped.