The coastal area of Flanders was flooded twice per day from the 3rd century to the 8th century by the North Sea at the time when the coast was frequently visited by Frisian (cattle) traders and probably largely inhabited by Frisians.
Flandria rannikuala oli 3. sajandist 8. sajandini Põhjamere poolt kaks korda päevas üle ujutatud ajal, kui rannikut külastasid sageli friisi (karja)kaupmehed ja arvatavasti osaliselt asusid sinna.