The fourth period saw the emergence of a "mainland" thanks to tunnels and bridges. In 1973 the Streymin Bridge, the first bridge between two Faroese islands, was established between Norðskáli on Eysturoy and Nesvík on Streymoy; in 1976 the new tunnel between Norðskáli and Eysturoy was completed. The Faroes' two largest islands were connected into what is now referred to as "Meginlandið", the Mainland. In 1975 the causeway between Viðoy and Borðoy was constructed, in 1986 a similar one between Borðoy and Kunoy was established, and in 1992 the capital Tórshavn was granted a first-class connection to the northern parts of the islands, creating the infrastructural prerequisites for a mobile society on the mainland.