Olef Dam
The 928th tallest dam in the world
The Olef Dam (Oleftalsperre) is located in the vicinity of the Eifel National Park near Hellenthal within the High Fens-Eifel Nature Park in the county of Euskirchen in the German state of North Rhine-Westphalia. Its reservoir stores around 20 million cubic metres and is fed by the River Olef.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).