Kastellholmen
Kastellholmen is a small island in the centre of , Sweden, connected to the adjacent Skeppsholmen through the bridge Kastellholmsbron. It has an area of 31,000 m².
On the island there is a small castle, , which was built by Fredrik Blom. Kastellholmen has previously been known as Notholmen, Lilla Beckholmen and Skansholmen. Kastellholmen is part of the Royal National City Park.
Coordinates: 59°19′20″N 18°05′22″E / 59.32222°N 18.08944°E
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