Dunsum is a municipality located on the western shore of Föhr in the district of Nordfriesland, in Schleswig-Holstein, Germany. It is composed of the districts of Greater and Lesser Dunsum.
From Dunsum, guided mudflat hikings to the neighbouring island of Amrum are offered at low tide. Amrum and Sylt can be seen from there. In the tidal flats north of the village the Baalkstian is located, a large glacial erratic, which was destroyed during a storm surge. The tale has it, that a treasure is hidden below the rock, yet it has never been found.
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