Vatersay Causeway
The 928th tallest dam in the world
The Vatersay Causeway (Scottish Gaelic: Rathad Bhàgh Bhatarsaigh) is a 250-metre-long causeway that links the Scottish Hebridean Islands of Vatersay and Barra across the Sound of Vatersay (Scottish Gaelic: Caolas Bhatarsaigh). The causeway was constructed between 1989 and 1991, and provides a direct link between Vatersay, the most southerly inhabited island of the Outer Hebrides, and Barra. Before its inception, the island was reachable only via a passenger ferry from Castlebay, making the transportation of goods, cattle, or vehicles arduous, necessitating the hiring of private boats.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).