Hebben ze het hier misschien over Helgoland als rotsig eiland?
Citaat van Wikipedia:
In addition to German, the local population, who are ethnic Frisians, speak the Heligolandic dialect of the North Frisian language called Halunder. Heligoland used to be called Heyligeland, or "holy land", possibly due to the island's long association with the god Forseti.
