Kjelsås

Grefsen and Kjelsås were also part of the former municipality of Aker before the second world war, when the City of Oslo was confined to today's central areas.

[1] The district of Kjelsås offers ski jumps, slalom slopes and vast woodland areas for hiking.

Lake Maridalsvannet, located close to the woodlands, provides Oslo with its drinking water and is also the source of the Akerselva river, (formerly Frysjaelven).

Akerselva is the dividing line between many areas of Oslo including the northern suburbs.

Traditionally seen as Eastern or Western Oslo depending on which side of the river one is on.