Schielands Hoge Zeedijk
The 928th tallest dam in the world
Schielands Hoge Zeedijk, formerly called Hoogendijk ("high dike") is a Dutch dike in the province of South Holland that stretches from the Schie at Schiedam to the Gouwe near Gouda. Constructed in the 13th century, the dike continues to protect an area inhabited by 3 million people from flooding by the North Sea.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).