This sector is the north-eastern part of the Defence Line.
 Sector depot Ilpendam, Materials Division
Located between the village Het Schouw and Slochterbrug, along the Canal through North-Holland. Used for the storage of artillery and other materials.
Partly dismantled except a official residence and three warehouses.
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 Sector depot Ilpendam, Ammunition Division
Close to Amsterdam, along the Canal through North-Holland for easy shipping. Used for the storage of ammunition for this sector. Floating ammunition storage was in boats on the canal.
Completely dismantled.
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 Sea dike
The Navy defended the sea dike of the Zuiderzee (Southern Sea) against alien landings. De wet lands behind the dike made a landing and troop movements very difficult. Nonetheless several temporarily entrenchments were planned for.
In 1932, the Enclosing Dike or Great Dike was completed and the Zuiderzee became a lake, the IJsselmeer (Lake IJssel). Landings became even more unlikely and defences were scaled down.
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 Battery near Uitdam
A coastal battery, similar to the Battery near Diemerdam and the Battery near Durgerdam, was planned in 1890. It would have had four 15 cm guns and housed 40 men. It is unlikely the battery was built with concrete but probably as earthwork like they were in use in e.g. 1916. There are no known remains.
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 Battery Janhagelhoek
A coastal battery, similar to the Battery near Diemerdam and the Battery near Durgerdam, was planned in 1890. It would have had four 15 cm guns and housed 40 men. It is unlikely the battery was built with concrete but probably as earthwork like they were in use in e.g. 1916. There are no known remains.
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 Fort near Edam
Completed in 1912 and in use as ammunition-storage until 1986. The kitchen kettles are still present.
Located near the Sea dike, it has an advanced casemate rather than a turret.
Now owned by the National Forest Service.
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 Fort near Kwadijk
Unfinished when the Great War started and construction was aborted. The foundation and floors were removed, the walls flattened and the wet moat closed in 1962. Only the fort watchman's house and the engineering shed were completed and are still present.
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 Inundation dike Kwadijk
To function as an inundation dike, the road of the village Kwadijk was raised by one meter in 1891. As a military road it was covered with brick, which it still is.
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 Fort north of Purmerend
A bombproof building constructed between 1909 and 1912 for 290 soldiers.
Now houses a wine import company.
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 Inundation dikes Beemster
The polder Beemster would be split into three different inundation-areas by two inundation dikes which used existing or raised roads. Seven bridges with dam sluices would contain the water into one area. The area in the southeast would stay dry while the northern area could be slightly inundated. Apart from the military inlet sluice, one bridge with dam sluice remains and one closable pipe under a road. The higher level of the roads isn't really noticeable. Most works were constructed between 1884 and 1900.
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 Fort along Nekkerweg
The bombproof main building was constructed between 1912 and 1913. In use since 1918 as military prison for conscientious objectors.
Modified between 2011-2012 for use as hotel and wellnes center.
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 Fort along Middenweg
One of the last two forts built, together with the Fort along Jisperweg, in 1912-1913. It had only one turret to save money.
The original discharging quay still exists. A large inlet sluice is located to the East.
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 Fort along Jisperweg
The other of the last two forts to be built. It also had only one turret to save money.
In use since 1918 as a military prison for prisoners who were not conscientious objectors.
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