The Channel Tunnel (French: le tunnel sous la Manche), or Chunnel, is a 50.450 km (31.35 mi) long rail tunnel beneath the English Channel at the Strait of Dover, connecting Folkestone, Kent in the United Kingdom ( ) to Coquelles near Calais in northern France ( ).
It was a megaproject with several false starts, but it was finally completed in 1994. It is the second-longest rail tunnel in the world, with the Seikan Tunnel in Japan being longer, but the undersea section of 37.9 km (23.55 miles) is the longest undersea tunnel in the world. It is operated by Eurotunnel. The American Society of Civil Engineers has declared the tunnel to be one of the Seven Wonders of the Modern World.