MainOne cable system is a 7,000km submarine cable with landing stations in Nigeria, Ghana and Portugal, with reserved branching units Morocco, Canary Islands, Senegal and Ivory Coast.

MainOne cable system is the first private subsea cable along the West African coastline, owned by MainOne Cable Company based in Nigeria. MainOne began the construction project in February 2008 and launched for commercial service in 2010. MainOne cable system was supplied by TE SubCom.

MainOne cable system has been proven to provide capacity of at least 4.96 Tbps.

MainOne cable is able to interconnect with SEACOM and other international cables from Seixal in Portugal, and extend to MainOne PoP at Telehouse North, London, via Tata Communications’ European and Transatlantic networks.

In September 2018, Orange announced to invest in the MainOne cable system, constructing two new branches and stations connecting the MainOne cable to Dakar in Senegal and Abidjan in the Côte d’Ivoire.