Sloedam
The 928th tallest dam in the world
The Sloedam is a 1 km long dam, that was constructed in 1871, as a necessary part of the Roosendaal-Vlissingen Railway, the so-called Zeeuwse Lijn (Zealandic Line). Additionally this dam connected the island of Walcheren with Zuid-Beveland across the Sloe waterway, and therefore with the mainland of Brabant.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).