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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 Mouette rieuse, as well as populations of Grèbe huppé, Foulque macroule, Gallinule poule-d'eau and Fuligule morillon. You can also find Bruant des roseaux, Rousserolle effarvatte and the occational Pouillot siffleur 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 Canard souchet, Grèbe esclavon and waders.
In winter, large flocks of Canard colvert stay at the lake, with the occational Canard pilet and Canard siffleur thrown in. Various geese and Foulque macroule are also known to winter here. As a bonus, encountering Mésange à longue queue 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).
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