Sluizencomplex Aduarderzijl
The first locks in Aduarderzijl were built early on: around 1400. The lock, then still made of wood, allowed excess water from the area around the city of Groningen to enter the Reitdiep.
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Until the nineteenth century, the Reitdiep was in open connection with the sea, allowing the water to flow away. During the St Martin's Flood in 1686, this lock was completely swept away. Today, two locks can be found in Aduard: the Aduarderzijlen, a western sluice built in 1706 and an eastern one from 1867.