Österskär is eastern part of Åkersberga, Österåker Municipality in Sweden. The area is located in a hilly peninsula between Tunaviken and Sätterfjärden northwest of Trälhavet. Due to the height differences and the possibility to get a sea view, many Stockholmers have their boats in one of Österskär's many marinas.

Map showing location of “Österskär” in Åkersberga, Sweden

Åkersberga, Sweden

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