Larvik the river Numedalslågen, locally called "Lågen", which terminates in Larvik, east of the town. Other bodies of water include the lakes Farris, Goksjø and Hallevatnet. Larvik is also noted for its natural springs of mineral water, "Farriskildene", which have been commercially exploited under the brand name "Farris". At Kaupang in Tjølling lies the remains of the medieval Skiringssal trading outpost. Larvik is also home to the world's northernmost natural occurrence of "Fagus sylvatica" forests (European Beech tree), known as "Bøkeskogen" ("The Birch Tree Forest"). Larvik Municipality is home to one city and 7 villages: Himberg is an exclave which is
Hylorina sylvatica Hylorina sylvatica Hylorina sylvatica (also known as the Emerald forest frog, or in Spanish, sapo arboreo) is a species of frog in the family Batrachylidae. It is monotypic within the genus Hylorina. It is found in Argentina and Chile. This species is endemic to the austral "Nothofagus" forests of Chile and Argentina with a narrow distribution along the eastern slopes of the Andes. Male "Hylorina sylvatica" grow to snout-vent length of and females to . They are emerald-green during the day while they turn dark green at night. Adults can be found in permanent and temporary pools, swamps, and marshes.