Used in a narrower sense, the term also refers to an ethnic sub-group of the Frisians from the region of North Frisia, which lies primarily on the German North Sea coast, and on the island of Heligoland.
The North Frisian language area also includes the offshore islands of Sylt, Föhr, Amrum and Heligoland (in the district of Pinneberg) and a number of smaller islands, the Halligen.
Around 800 AD, the Frisians migrated into what later became Uthlande in the Duchy of Schleswig.
Initially they only settled the offshore islands but, in a second wave of immigration around 1100, also populated the adjacent coastal strip between the rivers Eider and Vidå (German: Wiedau) on the Germano-Danish border.
[2] The colours gold, red and blue, like the coat of arms of North Frisia (which are not the same as those of the district of Nordfriesland), have been accorded official status by the Friisk Gesäts.