The Farris lake stretches from Kilen in Larvik in the south to Siljan in the north, and has an area of 21 km². Especially in summer, there is a lot of activity in Farris.
Many islands and coves offer unique opportunities for excursions, both by boat and canoe. It is also very nice to walk along Farris, and there are marked paths for this purpose. Both berries, mushrooms, birds and wildlife are found in abundance in these areas.
The Farris lake also consists of the Farris river, which flows into the sea at Larvik and is about 1,100 metres. The river's waterfall has been an important source of the city's industry since the 16th century.
Farriskilen in the south-east was in its time a hub for winter sports in Larvik, among other things for ice-skating and cross-country skiing.