Arnardalshamar Tunnel
The 529th longest tunnel in the world
The Arnardalshamar Tunnel is a tunnel in Iceland, located in Westfjords along Route 61. It has a length of 30 m (98 ft) and was opened in 1948. It was the first manmade tunnel in Iceland and it is also the shortest. It cuts through a basalt dike known as Arnardalshamar, between Skutulsfjörður and Álftafjörður. The tunnel was widened to 8.5 m (28 ft) in 1995.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).