The arms show three gold-colored oak leaves on a red background.

[4] (See also coat-of-arms of Eigersund, Songdalen, Tingvoll and Øvre Eiker) The municipality is located in the southern part of Buskerud county.

It borders the municipalities of Lier, Drammen, Hof, and Øvre Eiker.

The majority of the residents live in the villages of Mjøndalen, Krokstadelva, Solbergelva, and Steinberg.

It is one of the largest rivers in Norway, with a course running from Tyrifjorden in the north to Drammensfjord in the south.