The B/ON-1541 bunker is a German-built World War II defensive structure located in De Haan, West Flanders, Belgium. This APX 2 type bunker was part of the extensive Atlantic Wall fortifications constructed by Nazi Germany along the Belgian coast. The bunker's strategic position near the North Sea made it an important component of the coastal defense system designed to repel potential Allied invasions.
De Haan, known for its Belle Époque architecture and seaside location, became a fortified zone during the war years.