The Lex Frisionum, for instance, distinguishes three districts of Frisia, defining  West Frisia as the territory "between Zwin and Vlie" (present-day Holland and Zeeland) and East Frisia as the territory "between Lauwers and Weser".
The Lex Frisionum, in its classification of Frisia, distinguishes three districts: West Frisia defined as the territory "between Zwin and Vlie" (present-day Holland and Zeeland), and East Frisia designated as the area "between Lauwers and Weser".