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Kolsås (Norwegian pronunciation: [²køːʂɔːs]) is a wooded mountain ridge in the municipality of Bærum, Norway. Geologically, Kolsås belongs to the Oslo Graben area. Its two peaks consist of hard rhomb porphyric lava covering softer rocks, forming steep cliffs to the east, south and west.
An old farm beneath the mountain has the name Kolsberg. The first element in this name is the genitive case of the old male name Kolr, and the last element is berg n 'mountain'. The parish and municipality of Bærum (Old Norse Bergheimr) is probably named after this prominent mountain. The last element in the name of the mountain was later changed to ås m 'mountain ridge' to distinguish it from the name of the farm.
Protected landscape area
Kolsås has been a training area for climbers since beginning of the 20th century. Today it is the largest rock climbing area in the Oslo region. The wall Øvre Sydstup on the southern wall has more than 200 climbing routes.
The northern hillside of Kolsås has alpine skiing facilities.
- Torp, Arne (2007). R - ei urokråke i språket. Oslo: Det Norske Samlaget. p. 102. ISBN 978-82-521-7000-9.
- (Norwegian) "Naturvernområder i Bærum" – Bærum kommune (Retrieved on March 30, 2008)
- (Norwegian) "Snelle-askeskog i Dalbo naturreservat" (Retrieved on March 30, 2008)
- (Norwegian) "Klatring på Kolsås i hundre år" (Retrieved on March 30, 2008)
- (Norwegian) "Kolsås klatreklubb: Klatrefører for Oslo og omegn" (Retrieved on March 30, 2008)
- "NATO handbook07 uploaded March 25, 1993" (Retrieved on March 30, 2008)
- "Claude Monet: Mont Kolsaas (1895)" (Retrieved on March 30, 2008)
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