English: The Lillomarka nature reserve is located at the border between Oslo and Nittedal, north of Groruddalen, Norway. The forest area is centrally located between Kjelsås, Groruddalen, Gjelleråsen and southern parts of Nittedal. There is good access to Lillomarka from all the residential areas around this part of Marka, and a large number of people use the area as a nearby recreation area.

The reserve constitutes a hilly area with larger patches, deep crevices with ponds, mountain walls and scree slopes. The leaf tree is significant in parts of areas. Pine is spread throughout most of the area, some places with quite large dimensions. Slengfemåsan / Revlikollen, parts of Grytdalen, Granberget and the area east of Nordre Langevann have larger areas with high-quality old forests, with some features of richer forest types. Although not all the woodland areas are connected, they form a larger old forest area with great potential for increased biological diversity associated with death in the long term.

Source: Norwegian Environment Agency. www.naturbase.no