The wooded and hilly area of around 300 square kilometres is bordered by Oslo and by the municipalities of Ringerike, Hole and Bærum. The highest points in the landscape are Oppkuven (704 m.), Ringkollen (702 m) and Gyrihaugen (682 m). The old road through Krokskogen which opened in 1805 was part of the King's Road (Ringeriksveien) from Oslo to Bergen. It is now mostly used as a hiking and bridal trail in season and for timber transport during the winter.
- Geir Thorsnæs. "Krokskogen". In Henriksen, Petter. Store norske leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 4 February 2010.
- Geir Thorsnæs. "Oppkuven". Store norske leksikon. Retrieved October 1, 2016.
- Geir Thorsnæs. "Ringkollen". Store norske leksikon. Retrieved October 1, 2016.
- Geir Thorsnæs. "Gyrihaugen". Store norske leksikon. Retrieved October 1, 2016.
- Grimstad, Sverre (2007) Krokskogen på kryss og tvers (topografisk forl) ISBN 9788279810391
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