island chain in the North Sea, extending along the coast of NW Europe: it is divided into three groups, one belonging to the Netherlands (), one belonging to Germany (), & one divided between Germany & Denmark ()
See Frisian Islands in American Heritage Dictionary 4
A chain of islands in the North Sea off the coast of the Netherlands, Germany, and Denmark. The West Frisian Islands belong to the Netherlands. The East Frisian Islands and most of the North Frisian Islands are part of Germany; the other North Frisians are Danish.