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Description
More than 230 species of birds have been recorded in and around Østensjøvannet. In summer the lake hosts a large colony of Pescăruș râzător, as well as populations of Corcodel mare, Lișiță, Găinușă de baltă and Rață moțată. You can also find Presură de stuf, Lăcar de stuf and the occational Pitulice sfârâitoare 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 Rață lingurar, Corcodel de iarnă and waders.
In winter, large flocks of Rață mare stay at the lake, with the occational Rață sulițar and Rață fluierătoare thrown in. Various geese and Lișiță are also known to winter here. As a bonus, encountering Pițigoi codat is not uncommon during the colder months.
Details
Access
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).