Netherlands, Sint Maarten. View from Westfriese Omringdijk near St Maarten at two workers in the bulbfield. The Westfriese Omringdijk (West-Frisian Circular Dyke) is a dyke system that protected the region of Westflinge, part of the historical region of West-Frisia. Westflinge is now commonly referred to as West-Frisia as the rest of historical West-Frisia assimilated with Holland. The dyke is In 1983 declared a provincial monument.