Negrón Tunnel
The 240th longest tunnel in the world
The Negrón Tunnel (Túnel del Negrón) is an automotive tunnel which connects the provinces of Asturias and León in Northern Spain. The tunnel is 4,144 metres (13, 596 ft) long and reaches a height of 1,229 metres (4, 032 ft). The tunnel is in the toll highway AP-66, which is part of the Autovía A-66, one of the longest highways in Spain. The tunnel provides an alternate route to the Puerto de Pajares, a mountain pass that is considered dangerous for motorists.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).