In the district Østensjø you will find Østensjøvannet, surrounded by residential areas such as Bogerud, Abildsø, Manglerud, Oppsal, Ulsrud, etc. The lake is considered one of Norway’s most species-rich for water and swamp vegetation, and this leads to a rich bird and animal life. The tributary comes from Smedbergbekken, Bølerbekken and Ulsrudbekken; and flows into the Alna River via Østensjøbekken.
