Eikeren

Eikeren or Eikern is a long and deep lake in the municipalities of Hof in the county of Vestfold and Øvre Eiker in the county of Buskerud, Norway. It is the largest lake in Vestfold.

At the eastern end of Vestfold is the village of Eidsfoss. In this area, water flows into Lake Eikeren from the Bergsvann, Vikevann, Haugestadvann and Hillestadvann. Lake Eikeren also receives waterflow from the Hakavikelva and Steinbruelva Rivers.

In the western part, Eikeren comes together with the Fiskumvannet in a narrow, strait known as Sundet. Here water flows into Lake Fiskum, located at the top of Eikernvassdraget. Through this strait, water flows at an average of 7 m3 per second. From Lake Fiskum, water runs out into Vestfosselva to Vestfossen. The river then go to Hokksund, where it splits into two river that both flow in the Drammen River.

In 2005, Lake Eikeren was developed by the Vestfold Inter Municipal Waterworks, (Vestfold Interkommunale Vannverk), in order to provide extra drinking water for Vestfold. The other source is Farrisvannet, a lake on the border between the counties of Vestfold and Telemark. Vestfold Inter Municipal Waterworks Authority is a company owned by ten municipalities in Vestfold and is responsible for water supply, water treatment, emergency power supply and the main distribution to its members.