West Frisia

From west +‎ Frisia.

West Frisia

1. The traditionally Frisian areas that are located west of the Dollart (i.e. in the Netherlands), covering the province of Frisia, the Ommelanden and West Friesland.
2. The area between the Vlie and Lauwers, covering the Dutch province of Frisia.
3. West Friesland, a region in northern North Holland delineated by the Westfriese Omringdijk.
4. (historical) The territory of the Frisian realm located west of the Vlie, covering parts of Holland and Zeeland.
   • 2013, John Hines, Nelleke IJssennagger, Frisians and Their North Sea Neighbours: From the Fifth Century to the Viking Age, →ISBN, page 3:

     In [the Lex Frisionum], Frisia extends from the River Zwin on the northern edge of medieval and modern Flanders to the River Weser, which flows through Niedersachsen in Germany to the North Sea, but it is divived into three parts. West Frisia lies between Zwin and the Vlie, and thus comprises the provinces of Zeeland and both South and North Holland in the modern Netherlands. […]

The term "West Frisia" can refer to various parts of the historical region of Frisia.