The town of Farum adjoins the northern edge of the lake, while the southern and western sides consist of unpopulated woodland with several camping places.

The lake is the 3rd largest in the Mølleå[1] river course, after the adjacent larger Furesø and Bagsværd Sø.

The lake has 2 small islands: Svaneholm and Klaus Nars Holm, on the latter of which is a privately owned home.

During periods of strong easterly winds on Furesø, this flow can be reversed, raising the level of Farum Lake.

Water quality in the lake is generally good and has been improving in recent years, but is not yet up to standards set by the authorities.