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Østensjøvannet is a shallow lake in the eastern part of Oslo, in semi-rural surroundings. The area has a unique biology.
More than 230 species of birds have been recorded in and around Østensjøvannet. In summer the lake hosts a large colony of Black-headed Gull, as well as populations of Great Crested Grebe, Eurasian Coot, Eurasian Moorhen and Tufted Duck. You can also find Reed Bunting, Reed Warbler and the occational Wood Warbler here.
It is a popular area for recreation, and there is a path all around the lake with plenty of good viewpoints. The path brings you quite close to the water's edge. There is also a bird hide on the west side of the lake, which provies good views of the central parts.
During spring and autumn the lake is used as a stopover by numerous species, such as Northern Shoveler, Slavonian Grebe and waders.
In winter, large flocks of Mallard stay at the lake, with the occational Northern Pintail and Eurasian Wigeon thrown in. Various geese and Eurasian Coot are also known to winter here. As a bonus, encountering Long-tailed Tit is not uncommon during the colder months.
There is a parking site south of the lake. The area can also be reached by bus (Abildsø) and the subway (Skullerudåsen, Bøler). The paths around the lake are mostly prepared for biking, but walking around the lake (with plenty of stops) won't take more than about 2 hours (4,5 km).