The huge square blocks of stone scattered in the area are the result of the earthquakes produced by the tension caused by the retiring ice.

The geologist Gerhard de Geer studied the surrounding moraine ridges, which were eventually given his name, and geological excursions are still common in the area.

[1] The flora in the lake itself is reduced to a few species, including White Waterlily, Common Bladderwort, and Whorled Water-Milfoil; while others plants are found along the beaches, including Narrow Leaf Cattail, Slender Tufted-sedge, Greater Pond-sedge, Marsh Cinquefoil, Gypsywort, Yellow loosestrife, Purple Loosestrife, and Corn Mint.

[3] A population of Great Crested Newt has now vanished, but the City of Stockholm is planning to reintroduce them by constructing dams and ponds to recreate their natural habitat.

[1][4] Walks around the lake are organized regularly by Bromma borough and the Society for Nature Conservation (Svenska Naturskyddsföreningen).