Østensjøvannet

Østensjøvannet () is a lake located in the Østensjø borough in Oslo, Norway. It is well known for the wide variety of birds and other wildlife that can be found there. It is currently a wildlife preserve, though urban development posed a serious threat to the lake and its environs during the 1980s and early 1990s. == Etymology == Østensjøvannet ("Østensjø lake") is named after the Østensjø farm (old Norse Austansjór). The first element is austan 'east of', and the last element is sjór 'sea, lake'. The farm was situated on the lake's east side. The last element is the finite form of vann 'water; lake'. The meaning of the name is then 'the lake belonging to Østensjø'.

== Wildlife == Østensjøvannet is well known for its birdlife, and over 200 different species of birds have been sighted at or near the lake, quite a significant number by Norwegian standards. Other wildlife is regularly sighted at the lake, but the variety of species is not much different from surrounding places, such as Østmarka. Fishing during the summer is forbidden, while ice-fishing is allowed.