Bunkers rarely stand alone. They belong to a line: a series of works meant to close off an area together. Below are the lines with objects on this map.
The coast, from Zeeland to the Wadden islands. Coastal batteries, radar stations and strongpoints around the ports.
232 objects on the map, 29 of them with a photograph
From Muiden to the Biesbosch. Nineteenth-century forts, joined in 1939 by hundreds of casemates and shelters.
360 objects on the map, 85 of them with a photograph
From the Grebbeberg to the IJsselmeer. Three days of fighting here in May 1940.
123 objects on the map, 73 of them with a photograph
Casemates along the IJssel from 1940, and in the Cold War weirs and bunkers meant to flood the river inland.
4 objects on the map, 1 of them with a photograph
7 objects on the map
An object is listed under a line only if OpenStreetMap records it as such, for instance in its name, a reference or the commissioning party. Location does not count: a bunker on the coast is not automatically Atlantikwall, because Dutch work from 1939 stands there too. The lists are therefore incomplete; what is there can be checked through the source link on every object.